diff --git a/src/battle_anim.c b/src/battle_anim.c
index b6f726897..2d514c955 100644
--- a/src/battle_anim.c
+++ b/src/battle_anim.c
@@ -558,7 +558,7 @@ static void sub_80A40F4(u8 taskId)
 
     s16 *selfData = gTasks[taskId].data;
     u8 battlerSpriteId = gBattlerSpriteIds[selfData[t1_MONBG_BATTLER]];
-    gSprites[battlerSpriteId].invisible = 1;
+    gSprites[battlerSpriteId].invisible = TRUE;
 
     if (!selfData[t1_CREATE_ANOTHER_TASK])
     {
@@ -699,7 +699,7 @@ void sub_80A438C(u8 battlerId, bool8 toBG_2, bool8 setSpriteInvisible)
 
         gBattle_BG1_Y =  -(gSprites[battlerSpriteId].pos1.y + gSprites[battlerSpriteId].pos2.y) + 0x20;
         if (setSpriteInvisible)
-            gSprites[gBattlerSpriteIds[battlerId]].invisible = 1;
+            gSprites[gBattlerSpriteIds[battlerId]].invisible = TRUE;
 
         SetGpuReg(REG_OFFSET_BG1HOFS, gBattle_BG1_X);
         SetGpuReg(REG_OFFSET_BG1VOFS, gBattle_BG1_Y);
@@ -734,7 +734,7 @@ void sub_80A438C(u8 battlerId, bool8 toBG_2, bool8 setSpriteInvisible)
         gBattle_BG2_Y =  -(gSprites[battlerSpriteId].pos1.y + gSprites[battlerSpriteId].pos2.y) + 0x20;
 
         if (setSpriteInvisible)
-            gSprites[gBattlerSpriteIds[battlerId]].invisible = 1;
+            gSprites[gBattlerSpriteIds[battlerId]].invisible = TRUE;
 
         SetGpuReg(REG_OFFSET_BG2HOFS, gBattle_BG2_X);
         SetGpuReg(REG_OFFSET_BG2VOFS, gBattle_BG2_Y);
@@ -866,9 +866,9 @@ static void ScriptCmd_clearmonbg(void)
         battlerId = gBattleAnimTarget;
 
     if (sMonAnimTaskIdArray[0] != 0xFF)
-        gSprites[gBattlerSpriteIds[battlerId]].invisible = 0;
+        gSprites[gBattlerSpriteIds[battlerId]].invisible = FALSE;
     if (animBattlerId > 1 && sMonAnimTaskIdArray[1] != 0xFF)
-        gSprites[gBattlerSpriteIds[battlerId ^ BIT_FLANK]].invisible = 0;
+        gSprites[gBattlerSpriteIds[battlerId ^ BIT_FLANK]].invisible = FALSE;
     else
         animBattlerId = 0;
 
@@ -973,9 +973,9 @@ static void ScriptCmd_clearmonbg_23(void)
         battlerId = gBattleAnimTarget;
 
     if (IsBattlerSpriteVisible(battlerId))
-        gSprites[gBattlerSpriteIds[battlerId]].invisible = 0;
+        gSprites[gBattlerSpriteIds[battlerId]].invisible = FALSE;
     if (animBattlerId > 1 && IsBattlerSpriteVisible(battlerId ^ BIT_FLANK))
-        gSprites[gBattlerSpriteIds[battlerId ^ BIT_FLANK]].invisible = 0;
+        gSprites[gBattlerSpriteIds[battlerId ^ BIT_FLANK]].invisible = FALSE;
     else
         animBattlerId = 0;
 
@@ -1745,7 +1745,7 @@ static void ScriptCmd_invisible(void)
 
     spriteId = GetAnimBattlerSpriteId(sBattleAnimScriptPtr[1]);
     if (spriteId != 0xFF)
-        gSprites[spriteId].invisible = 1;
+        gSprites[spriteId].invisible = TRUE;
 
     sBattleAnimScriptPtr += 2;
 }
@@ -1756,7 +1756,7 @@ static void ScriptCmd_visible(void)
 
     spriteId = GetAnimBattlerSpriteId(sBattleAnimScriptPtr[1]);
     if (spriteId != 0xFF)
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
 
     sBattleAnimScriptPtr += 2;
 }
diff --git a/src/battle_bg.c b/src/battle_bg.c
index 999b64a54..fb3e52eac 100644
--- a/src/battle_bg.c
+++ b/src/battle_bg.c
@@ -412,8 +412,8 @@ void sub_8035D74(u8 taskId)
         gPlttBufferUnfaded[palId * 16 + 0x10F] = gPlttBufferFaded[palId * 16 + 0x10F] = 0x7FFF;
         gBattleStruct->field_7D = CreateSprite(&gUnknown_0831A9D0, 111, 80, 0);
         gBattleStruct->field_7E = CreateSprite(&gUnknown_0831A9E8, 129, 80, 0);
-        gSprites[gBattleStruct->field_7D].invisible = 1;
-        gSprites[gBattleStruct->field_7E].invisible = 1;
+        gSprites[gBattleStruct->field_7D].invisible = TRUE;
+        gSprites[gBattleStruct->field_7E].invisible = TRUE;
         gTasks[taskId].data[0]++;
         break;
     case 2:
@@ -444,8 +444,8 @@ void sub_8035D74(u8 taskId)
 
             PlaySE(SE_W231);
             DestroyTask(taskId);
-            gSprites[gBattleStruct->field_7D].invisible = 0;
-            gSprites[gBattleStruct->field_7E].invisible = 0;
+            gSprites[gBattleStruct->field_7D].invisible = FALSE;
+            gSprites[gBattleStruct->field_7E].invisible = FALSE;
             gSprites[gBattleStruct->field_7E].oam.tileNum += 0x40;
             gSprites[gBattleStruct->field_7D].data[0] = 0;
             gSprites[gBattleStruct->field_7E].data[0] = 1;
diff --git a/src/battle_controller_link_opponent.c b/src/battle_controller_link_opponent.c
index d786dacd1..637b8c702 100644
--- a/src/battle_controller_link_opponent.c
+++ b/src/battle_controller_link_opponent.c
@@ -442,7 +442,7 @@ static void DoHitAnimBlinkSpriteEffect(void)
     if (gSprites[spriteId].data[1] == 32)
     {
         gSprites[spriteId].data[1] = 0;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gDoingBattleAnim = FALSE;
         LinkOpponentBufferExecCompleted();
     }
diff --git a/src/battle_controller_link_partner.c b/src/battle_controller_link_partner.c
index 9867c14e4..bfaaf9e82 100644
--- a/src/battle_controller_link_partner.c
+++ b/src/battle_controller_link_partner.c
@@ -332,7 +332,7 @@ static void DoHitAnimBlinkSpriteEffect(void)
     if (gSprites[spriteId].data[1] == 32)
     {
         gSprites[spriteId].data[1] = 0;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gDoingBattleAnim = FALSE;
         LinkPartnerBufferExecCompleted();
     }
diff --git a/src/battle_controller_opponent.c b/src/battle_controller_opponent.c
index 6148587f8..3c126aeec 100644
--- a/src/battle_controller_opponent.c
+++ b/src/battle_controller_opponent.c
@@ -435,7 +435,7 @@ static void DoHitAnimBlinkSpriteEffect(void)
     if (gSprites[spriteId].data[1] == 32)
     {
         gSprites[spriteId].data[1] = 0;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gDoingBattleAnim = FALSE;
         OpponentBufferExecCompleted();
     }
diff --git a/src/battle_controller_player.c b/src/battle_controller_player.c
index 7f038a0c3..57a4efa9f 100644
--- a/src/battle_controller_player.c
+++ b/src/battle_controller_player.c
@@ -1398,7 +1398,7 @@ static void DoHitAnimBlinkSpriteEffect(void)
     if (gSprites[spriteId].data[1] == 32)
     {
         gSprites[spriteId].data[1] = 0;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gDoingBattleAnim = FALSE;
         PlayerBufferExecCompleted();
     }
diff --git a/src/battle_controller_player_partner.c b/src/battle_controller_player_partner.c
index 601b8dcc1..7795c5656 100644
--- a/src/battle_controller_player_partner.c
+++ b/src/battle_controller_player_partner.c
@@ -520,7 +520,7 @@ static void DoHitAnimBlinkSpriteEffect(void)
     if (gSprites[spriteId].data[1] == 32)
     {
         gSprites[spriteId].data[1] = 0;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gDoingBattleAnim = FALSE;
         PlayerPartnerBufferExecCompleted();
     }
diff --git a/src/battle_controller_recorded_opponent.c b/src/battle_controller_recorded_opponent.c
index affcb09ab..963c535db 100644
--- a/src/battle_controller_recorded_opponent.c
+++ b/src/battle_controller_recorded_opponent.c
@@ -425,7 +425,7 @@ static void DoHitAnimBlinkSpriteEffect(void)
     if (gSprites[spriteId].data[1] == 32)
     {
         gSprites[spriteId].data[1] = 0;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gDoingBattleAnim = FALSE;
         RecordedOpponentBufferExecCompleted();
     }
diff --git a/src/battle_controller_recorded_player.c b/src/battle_controller_recorded_player.c
index 4f224bc67..1a043573f 100644
--- a/src/battle_controller_recorded_player.c
+++ b/src/battle_controller_recorded_player.c
@@ -415,7 +415,7 @@ static void DoHitAnimBlinkSpriteEffect(void)
     if (gSprites[spriteId].data[1] == 32)
     {
         gSprites[spriteId].data[1] = 0;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gDoingBattleAnim = FALSE;
         RecordedPlayerBufferExecCompleted();
     }
diff --git a/src/battle_controller_wally.c b/src/battle_controller_wally.c
index 4faf78681..747aa2987 100644
--- a/src/battle_controller_wally.c
+++ b/src/battle_controller_wally.c
@@ -371,7 +371,7 @@ static void DoHitAnimBlinkSpriteEffect(void)
     if (gSprites[spriteId].data[1] == 32)
     {
         gSprites[spriteId].data[1] = 0;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gDoingBattleAnim = FALSE;
         WallyBufferExecCompleted();
     }
diff --git a/src/battle_dome.c b/src/battle_dome.c
index 0815b6a9b..82384b43a 100644
--- a/src/battle_dome.c
+++ b/src/battle_dome.c
@@ -3622,7 +3622,7 @@ static void sub_8190400(u8 taskId)
             gSprites[r7].data[0] = i;
             gSprites[r7].data[1] = 0;
             if (r9 == 1)
-                gSprites[r7].invisible = 1;
+                gSprites[r7].invisible = TRUE;
 
             r7 = CreateSprite(&gUnknown_0860D050, 234, 80, 0);
             StartSpriteAnim(&gSprites[r7], 1);
@@ -3644,7 +3644,7 @@ static void SpriteCb_TrainerIconCardScrollUp(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         if (sprite->pos1.y >= -32)
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         if (++sprite->data[1] == 40)
             sprite->callback = SpriteCallbackDummy;
     }
@@ -3664,7 +3664,7 @@ static void SpriteCb_TrainerIconCardScrollDown(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         if (sprite->pos1.y <= 192)
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         if (++sprite->data[1] == 40)
             sprite->callback = SpriteCallbackDummy;
     }
@@ -3684,7 +3684,7 @@ static void SpriteCb_TrainerIconCardScrollLeft(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         if (sprite->pos1.x >= -32)
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         if (++sprite->data[1] == 64)
             sprite->callback = SpriteCallbackDummy;
     }
@@ -3704,7 +3704,7 @@ static void SpriteCb_TrainerIconCardScrollRight(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         if (sprite->pos1.x <= 272)
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         if (++sprite->data[1] == 64)
             sprite->callback = SpriteCallbackDummy;
     }
@@ -3734,7 +3734,7 @@ static void SpriteCb_MonIconCardScrollUp(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         if (sprite->pos1.y >= -16)
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         if (++sprite->data[1] == 40)
             sprite->callback = SpriteCb_MonIcon;
     }
@@ -3756,7 +3756,7 @@ static void SpriteCb_MonIconCardScrollDown(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         if (sprite->pos1.y <= 176)
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         if (++sprite->data[1] == 40)
             sprite->callback = SpriteCb_MonIcon;
     }
@@ -3778,7 +3778,7 @@ static void SpriteCb_MonIconCardScrollLeft(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         if (sprite->pos1.x >= -16)
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         if (++sprite->data[1] == 64)
             sprite->callback = SpriteCb_MonIcon;
     }
@@ -3800,7 +3800,7 @@ static void SpriteCb_MonIconCardScrollRight(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         if (sprite->pos1.x <= 256)
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         if (++sprite->data[1] == 64)
             sprite->callback = SpriteCb_MonIcon;
     }
@@ -3828,29 +3828,29 @@ static void sub_8190B40(struct Sprite *sprite)
             if ((gSaveBlock2Ptr->frontier.domeTrainers[tournmanetTrainerId].isEliminated
                 && sBattleDomeStruct->unk_10 - 1 < gSaveBlock2Ptr->frontier.domeTrainers[tournmanetTrainerId].eliminatedAt))
             {
-                sprite->invisible = 0;
+                sprite->invisible = FALSE;
             }
             else if (!gSaveBlock2Ptr->frontier.domeTrainers[tournmanetTrainerId].isEliminated
                      && sBattleDomeStruct->unk_10 - 1 < r12)
             {
-                sprite->invisible = 0;
+                sprite->invisible = FALSE;
             }
             else
             {
                 if (gTasks[taskId1].data[0] == 2)
-                    sprite->invisible = 1;
+                    sprite->invisible = TRUE;
             }
         }
         else
         {
             if (sBattleDomeStruct->unk_10 != 0)
             {
-                sprite->invisible = 0;
+                sprite->invisible = FALSE;
             }
             else
             {
                 if (gTasks[taskId1].data[0] == 2)
-                    sprite->invisible = 1;
+                    sprite->invisible = TRUE;
             }
         }
     }
@@ -3861,23 +3861,23 @@ static void sub_8190B40(struct Sprite *sprite)
             if (sBattleDomeStruct->unk_10 > 1)
             {
                 if (gTasks[taskId1].data[0] == 2)
-                    sprite->invisible = 1;
+                    sprite->invisible = TRUE;
             }
             else
             {
-                sprite->invisible = 0;
+                sprite->invisible = FALSE;
             }
         }
         else
         {
             if (sBattleDomeStruct->unk_10 != 0)
             {
-                sprite->invisible = 0;
+                sprite->invisible = FALSE;
             }
             else
             {
                 if (gTasks[taskId1].data[0] == 2)
-                    sprite->invisible = 1;
+                    sprite->invisible = TRUE;
             }
         }
     }
@@ -3892,11 +3892,11 @@ static void sub_8190C6C(struct Sprite *sprite)
         if (sBattleDomeStruct->unk_10 != 0)
         {
             if (gTasks[taskId1].data[0] == 2)
-                sprite->invisible = 1;
+                sprite->invisible = TRUE;
         }
         else
         {
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         }
     }
     else
@@ -3904,11 +3904,11 @@ static void sub_8190C6C(struct Sprite *sprite)
         if (sBattleDomeStruct->unk_10 != 1)
         {
             if (gTasks[taskId1].data[0] == 2)
-                sprite->invisible = 1;
+                sprite->invisible = TRUE;
         }
         else
         {
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
         }
     }
 }
@@ -4770,7 +4770,7 @@ static void DisplayTrainerInfoOnCard(u8 flags, u8 trainerTournamentId)
         sBattleDomeStruct->arr[arrId] = CreateTrainerPicSprite(GetFrontierTrainerFrontSpriteId(trainerId), TRUE, x + 48, y + 64, palSlot + 12, 0xFFFF);
 
     if (flags & 0x1E)
-        gSprites[sBattleDomeStruct->arr[arrId]].invisible = 1;
+        gSprites[sBattleDomeStruct->arr[arrId]].invisible = TRUE;
 
     for (i = 0; i < 3; i++)
     {
@@ -4803,7 +4803,7 @@ static void DisplayTrainerInfoOnCard(u8 flags, u8 trainerTournamentId)
         }
 
         if (flags & 0x1E)
-            gSprites[sBattleDomeStruct->arr[2 + i + arrId]].invisible = 1;
+            gSprites[sBattleDomeStruct->arr[2 + i + arrId]].invisible = TRUE;
     }
     textPrinter.fontId = 2;
     textPrinter.x = 0;
@@ -5208,7 +5208,7 @@ static void DisplayMatchInfoOnCard(u8 flags, u8 matchNo)
         sBattleDomeStruct->arr[arrId] = CreateTrainerPicSprite(GetFrontierTrainerFrontSpriteId(trainerIds[0]), TRUE, x + 48, y + 88, palSlot + 12, 0xFFFF);
 
     if (flags & 0x1E)
-        gSprites[sBattleDomeStruct->arr[arrId]].invisible = 1;
+        gSprites[sBattleDomeStruct->arr[arrId]].invisible = TRUE;
     if (lost[0])
         gSprites[sBattleDomeStruct->arr[arrId]].oam.paletteNum = 3;
 
@@ -5221,7 +5221,7 @@ static void DisplayMatchInfoOnCard(u8 flags, u8 matchNo)
         sBattleDomeStruct->arr[1 + arrId] = CreateTrainerPicSprite(GetFrontierTrainerFrontSpriteId(trainerIds[1]), TRUE, x + 192, y + 88, palSlot + 13, 0xFFFF);
 
     if (flags & 0x1E)
-        gSprites[sBattleDomeStruct->arr[1 + arrId]].invisible = 1;
+        gSprites[sBattleDomeStruct->arr[1 + arrId]].invisible = TRUE;
     if (lost[1])
         gSprites[sBattleDomeStruct->arr[1 + arrId]].oam.paletteNum = 3;
 
@@ -5257,7 +5257,7 @@ static void DisplayMatchInfoOnCard(u8 flags, u8 matchNo)
         }
 
         if (flags & 0x1E)
-            gSprites[sBattleDomeStruct->arr[2 + i + arrId]].invisible = 1;
+            gSprites[sBattleDomeStruct->arr[2 + i + arrId]].invisible = TRUE;
         if (lost[0])
         {
             gSprites[sBattleDomeStruct->arr[2 + i + arrId]].oam.paletteNum = 3;
@@ -5297,7 +5297,7 @@ static void DisplayMatchInfoOnCard(u8 flags, u8 matchNo)
         }
 
         if (flags & 0x1E)
-            gSprites[sBattleDomeStruct->arr[5 + i + arrId]].invisible = 1;
+            gSprites[sBattleDomeStruct->arr[5 + i + arrId]].invisible = TRUE;
         if (lost[1])
         {
             gSprites[sBattleDomeStruct->arr[5 + i + arrId]].oam.paletteNum = 3;
diff --git a/src/battle_factory.c b/src/battle_factory.c
index a83a14e64..36c5ed2e8 100644
--- a/src/battle_factory.c
+++ b/src/battle_factory.c
@@ -1273,8 +1273,8 @@ static void Select_InitAllSprites(void)
     sFactorySelectScreen->menuCursor1SpriteId = CreateSprite(&gUnknown_08610608, 176, 112, 0);
     sFactorySelectScreen->menuCursor2SpriteId = CreateSprite(&gUnknown_08610620, 176, 144, 0);
 
-    gSprites[sFactorySelectScreen->menuCursor1SpriteId].invisible = 1;
-    gSprites[sFactorySelectScreen->menuCursor2SpriteId].invisible = 1;
+    gSprites[sFactorySelectScreen->menuCursor1SpriteId].invisible = TRUE;
+    gSprites[sFactorySelectScreen->menuCursor2SpriteId].invisible = TRUE;
 
     gSprites[sFactorySelectScreen->menuCursor1SpriteId].centerToCornerVecX = 0;
     gSprites[sFactorySelectScreen->menuCursor1SpriteId].centerToCornerVecY = 0;
@@ -1767,8 +1767,8 @@ static void Select_ShowMenuOptions(void)
     gSprites[sFactorySelectScreen->menuCursor2SpriteId].pos1.x = 208;
     gSprites[sFactorySelectScreen->menuCursor2SpriteId].pos1.y = (sFactorySelectScreen->menuCursorPos * 16) + 112;
 
-    gSprites[sFactorySelectScreen->menuCursor1SpriteId].invisible = 0;
-    gSprites[sFactorySelectScreen->menuCursor2SpriteId].invisible = 0;
+    gSprites[sFactorySelectScreen->menuCursor1SpriteId].invisible = FALSE;
+    gSprites[sFactorySelectScreen->menuCursor2SpriteId].invisible = FALSE;
 
     Select_PrintMenuOptions();
 }
@@ -1782,16 +1782,16 @@ static void Select_ShowYesNoOptions(void)
     gSprites[sFactorySelectScreen->menuCursor2SpriteId].pos1.x = 208;
     gSprites[sFactorySelectScreen->menuCursor2SpriteId].pos1.y = 112;
 
-    gSprites[sFactorySelectScreen->menuCursor1SpriteId].invisible = 0;
-    gSprites[sFactorySelectScreen->menuCursor2SpriteId].invisible = 0;
+    gSprites[sFactorySelectScreen->menuCursor1SpriteId].invisible = FALSE;
+    gSprites[sFactorySelectScreen->menuCursor2SpriteId].invisible = FALSE;
 
     Select_PrintYesNoOptions();
 }
 
 static void sub_819B958(u8 windowId)
 {
-    gSprites[sFactorySelectScreen->menuCursor1SpriteId].invisible = 1;
-    gSprites[sFactorySelectScreen->menuCursor2SpriteId].invisible = 1;
+    gSprites[sFactorySelectScreen->menuCursor1SpriteId].invisible = TRUE;
+    gSprites[sFactorySelectScreen->menuCursor2SpriteId].invisible = TRUE;
     FillWindowPixelBuffer(windowId, 0);
     CopyWindowToVram(windowId, 2);
     ClearWindowTilemap(windowId);
@@ -1977,7 +1977,7 @@ static void Select_ShowSummaryMonSprite(void)
     gSprites[sFactorySelectScreen->unk294[1].field0].centerToCornerVecX = 0;
     gSprites[sFactorySelectScreen->unk294[1].field0].centerToCornerVecY = 0;
 
-    gSprites[sFactorySelectScreen->unk294[1].field1].invisible = 1;
+    gSprites[sFactorySelectScreen->unk294[1].field1].invisible = TRUE;
 }
 
 static void Select_ShowChosenMonsSprites(void)
@@ -2013,9 +2013,9 @@ static void sub_819C040(struct Sprite *sprite)
         && gSprites[sFactorySelectScreen->unk294[0].field1].affineAnimEnded
         && gSprites[sFactorySelectScreen->unk294[2].field1].affineAnimEnded)
     {
-        sprite->invisible = 1;
-        gSprites[sFactorySelectScreen->unk294[0].field1].invisible = 1;
-        gSprites[sFactorySelectScreen->unk294[2].field1].invisible = 1;
+        sprite->invisible = TRUE;
+        gSprites[sFactorySelectScreen->unk294[0].field1].invisible = TRUE;
+        gSprites[sFactorySelectScreen->unk294[2].field1].invisible = TRUE;
 
         taskId = CreateTask(sub_819C1D0, 1);
         gTasks[taskId].func(taskId);
@@ -2091,11 +2091,11 @@ static void sub_819C2D4(u8 taskId)
     {
     default:
         HideBg(3);
-        gSprites[sFactorySelectScreen->unk294[1].field1].invisible = 0;
+        gSprites[sFactorySelectScreen->unk294[1].field1].invisible = FALSE;
         gSprites[sFactorySelectScreen->unk294[1].field1].callback = sub_819C100;
-        gSprites[sFactorySelectScreen->unk294[0].field1].invisible = 0;
+        gSprites[sFactorySelectScreen->unk294[0].field1].invisible = FALSE;
         gSprites[sFactorySelectScreen->unk294[0].field1].callback = SpriteCallbackDummy;
-        gSprites[sFactorySelectScreen->unk294[2].field1].invisible = 0;
+        gSprites[sFactorySelectScreen->unk294[2].field1].invisible = FALSE;
         gSprites[sFactorySelectScreen->unk294[2].field1].callback = SpriteCallbackDummy;
         StartSpriteAffineAnim(&gSprites[sFactorySelectScreen->unk294[1].field1], 1);
         StartSpriteAffineAnim(&gSprites[sFactorySelectScreen->unk294[0].field1], 1);
@@ -3018,7 +3018,7 @@ static void sub_819D770(u8 taskId)
         else
             Swap_PrintOnInfoWindow(gText_SelectPkmnToAccept);
         if (sFactorySwapScreen->cursorPos < 3)
-            gSprites[sFactorySwapScreen->cursorSpriteId].invisible = 0;
+            gSprites[sFactorySwapScreen->cursorSpriteId].invisible = FALSE;
         Swap_PrintMonCategory();
         gTasks[taskId].data[0]++;
         break;
@@ -3048,7 +3048,7 @@ static void sub_819D9EC(u8 taskId)
         break;
     case 1:
         sub_819EADC();
-        gSprites[sFactorySwapScreen->cursorSpriteId].invisible = 1;
+        gSprites[sFactorySwapScreen->cursorSpriteId].invisible = TRUE;
         gTasks[taskId].data[0]++;
         break;
     case 2:
@@ -3068,7 +3068,7 @@ static void sub_819D9EC(u8 taskId)
             {
                 Swap_InitActions(ACTIONS_PLAYER_SCREEN);
                 for (i = 0; i < 3; i++)
-                    gSprites[sFactorySwapScreen->unk8[1][i]].invisible = 1;
+                    gSprites[sFactorySwapScreen->unk8[1][i]].invisible = TRUE;
             }
             gSprites[sFactorySwapScreen->cursorSpriteId].pos1.x = gSprites[sFactorySwapScreen->ballSpriteIds[sFactorySwapScreen->cursorPos]].pos1.x;
             gTasks[sFactorySwapScreen->fadeSpeciesNameTaskId].func = Task_SwapFadeSpeciesName;
@@ -3279,8 +3279,8 @@ static void Swap_InitAllSprites(void)
     sFactorySwapScreen->cursorSpriteId = CreateSprite(&gUnknown_0861084C, gSprites[sFactorySwapScreen->ballSpriteIds[sFactorySwapScreen->cursorPos]].pos1.x, 88, 0);
     sFactorySwapScreen->menuCursor1SpriteId = CreateSprite(&gUnknown_08610864, 176, 112, 0);
     sFactorySwapScreen->menuCursor2SpriteId = CreateSprite(&gUnknown_0861087C, 176, 144, 0);
-    gSprites[sFactorySwapScreen->menuCursor1SpriteId].invisible = 1;
-    gSprites[sFactorySwapScreen->menuCursor2SpriteId].invisible = 1;
+    gSprites[sFactorySwapScreen->menuCursor1SpriteId].invisible = TRUE;
+    gSprites[sFactorySwapScreen->menuCursor2SpriteId].invisible = TRUE;
     gSprites[sFactorySwapScreen->menuCursor1SpriteId].centerToCornerVecX = 0;
     gSprites[sFactorySwapScreen->menuCursor1SpriteId].centerToCornerVecY = 0;
     gSprites[sFactorySwapScreen->menuCursor2SpriteId].centerToCornerVecX = 0;
@@ -3339,18 +3339,18 @@ static void Swap_InitAllSprites(void)
         gSprites[sFactorySwapScreen->unkE[i][1]].centerToCornerVecX = 0;
         gSprites[sFactorySwapScreen->unkE[i][1]].centerToCornerVecY = 0;
 
-        gSprites[sFactorySwapScreen->unk8[i][0]].invisible = 1;
-        gSprites[sFactorySwapScreen->unk8[i][1]].invisible = 1;
-        gSprites[sFactorySwapScreen->unk8[i][2]].invisible = 1;
-        gSprites[sFactorySwapScreen->unkE[i][0]].invisible = 1;
-        gSprites[sFactorySwapScreen->unkE[i][1]].invisible = 1;
+        gSprites[sFactorySwapScreen->unk8[i][0]].invisible = TRUE;
+        gSprites[sFactorySwapScreen->unk8[i][1]].invisible = TRUE;
+        gSprites[sFactorySwapScreen->unk8[i][2]].invisible = TRUE;
+        gSprites[sFactorySwapScreen->unkE[i][0]].invisible = TRUE;
+        gSprites[sFactorySwapScreen->unkE[i][1]].invisible = TRUE;
     }
 
-    gSprites[sFactorySwapScreen->unkE[0][0]].invisible = 0;
-    gSprites[sFactorySwapScreen->unkE[0][1]].invisible = 0;
-    gSprites[sFactorySwapScreen->unk8[0][0]].invisible = 0;
-    gSprites[sFactorySwapScreen->unk8[0][1]].invisible = 0;
-    gSprites[sFactorySwapScreen->unk8[0][2]].invisible = 0;
+    gSprites[sFactorySwapScreen->unkE[0][0]].invisible = FALSE;
+    gSprites[sFactorySwapScreen->unkE[0][1]].invisible = FALSE;
+    gSprites[sFactorySwapScreen->unk8[0][0]].invisible = FALSE;
+    gSprites[sFactorySwapScreen->unk8[0][1]].invisible = FALSE;
+    gSprites[sFactorySwapScreen->unk8[0][2]].invisible = FALSE;
 }
 
 static void Swap_DestroyAllSprites(void)
@@ -3378,13 +3378,13 @@ static void Swap_HandleActionCursorChange(u8 cursorId)
 {
     if (cursorId < 3)
     {
-        gSprites[sFactorySwapScreen->cursorSpriteId].invisible = 0;
+        gSprites[sFactorySwapScreen->cursorSpriteId].invisible = FALSE;
         sub_819E8EC();
         gSprites[sFactorySwapScreen->cursorSpriteId].pos1.x = gSprites[sFactorySwapScreen->ballSpriteIds[cursorId]].pos1.x;
     }
     else
     {
-        gSprites[sFactorySwapScreen->cursorSpriteId].invisible = 1;
+        gSprites[sFactorySwapScreen->cursorSpriteId].invisible = TRUE;
         sub_819E838(sFactorySwapScreen->actionsData[cursorId].id);
     }
 }
@@ -3490,15 +3490,15 @@ static void sub_819E838(u8 arg0)
     {
         if (arg0 == 2)
         {
-            gSprites[sFactorySwapScreen->unk8[1][i]].invisible = 0;
+            gSprites[sFactorySwapScreen->unk8[1][i]].invisible = FALSE;
             if (i < 2)
-                gSprites[sFactorySwapScreen->unkE[1][i]].invisible = 1;
+                gSprites[sFactorySwapScreen->unkE[1][i]].invisible = TRUE;
         }
         else if (arg0 == 3)
         {
             if (i < 2)
-                gSprites[sFactorySwapScreen->unkE[1][i]].invisible = 0;
-            gSprites[sFactorySwapScreen->unk8[1][i]].invisible = 1;
+                gSprites[sFactorySwapScreen->unkE[1][i]].invisible = FALSE;
+            gSprites[sFactorySwapScreen->unk8[1][i]].invisible = TRUE;
         }
     }
 }
@@ -3509,9 +3509,9 @@ static void sub_819E8EC(void)
 
     for (i = 0; i < 3; i++)
     {
-        gSprites[sFactorySwapScreen->unk8[1][i]].invisible = 1;
+        gSprites[sFactorySwapScreen->unk8[1][i]].invisible = TRUE;
         if (i < 2)
-            gSprites[sFactorySwapScreen->unkE[1][i]].invisible = 1;
+            gSprites[sFactorySwapScreen->unkE[1][i]].invisible = TRUE;
     }
 }
 
@@ -3527,8 +3527,8 @@ static void Swap_ShowMenuOptions(void)
     gSprites[sFactorySwapScreen->menuCursor2SpriteId].pos1.x = 208;
     gSprites[sFactorySwapScreen->menuCursor2SpriteId].pos1.y = (sFactorySwapScreen->menuCursorPos * 16) + 112;
 
-    gSprites[sFactorySwapScreen->menuCursor1SpriteId].invisible = 0;
-    gSprites[sFactorySwapScreen->menuCursor2SpriteId].invisible = 0;
+    gSprites[sFactorySwapScreen->menuCursor1SpriteId].invisible = FALSE;
+    gSprites[sFactorySwapScreen->menuCursor2SpriteId].invisible = FALSE;
 
     Swap_PrintMenuOptions();
 }
@@ -3542,16 +3542,16 @@ static void Swap_ShowYesNoOptions(void)
     gSprites[sFactorySwapScreen->menuCursor2SpriteId].pos1.x = 208;
     gSprites[sFactorySwapScreen->menuCursor2SpriteId].pos1.y = 112;
 
-    gSprites[sFactorySwapScreen->menuCursor1SpriteId].invisible = 0;
-    gSprites[sFactorySwapScreen->menuCursor2SpriteId].invisible = 0;
+    gSprites[sFactorySwapScreen->menuCursor1SpriteId].invisible = FALSE;
+    gSprites[sFactorySwapScreen->menuCursor2SpriteId].invisible = FALSE;
 
     Swap_PrintYesNoOptions();
 }
 
 static void sub_819EA64(u8 windowId)
 {
-    gSprites[sFactorySwapScreen->menuCursor1SpriteId].invisible = 1;
-    gSprites[sFactorySwapScreen->menuCursor2SpriteId].invisible = 1;
+    gSprites[sFactorySwapScreen->menuCursor1SpriteId].invisible = TRUE;
+    gSprites[sFactorySwapScreen->menuCursor2SpriteId].invisible = TRUE;
     FillWindowPixelBuffer(windowId, 0);
     CopyWindowToVram(windowId, 2);
     ClearWindowTilemap(windowId);
@@ -3900,7 +3900,7 @@ static void Swap_ShowSummaryMonSprite(void)
     gSprites[sFactorySwapScreen->unk2C.field0].centerToCornerVecX = 0;
     gSprites[sFactorySwapScreen->unk2C.field0].centerToCornerVecY = 0;
 
-    gSprites[sFactorySwapScreen->unk2C.field1].invisible = 1;
+    gSprites[sFactorySwapScreen->unk2C.field1].invisible = TRUE;
 }
 
 static void sub_819F3F8(struct UnkFactoryStruct arg0, bool8 *arg1, bool8 swapScreen)
@@ -3984,7 +3984,7 @@ static void sub_819F600(struct Sprite *sprite)
 
     if (sprite->affineAnimEnded)
     {
-        sprite->invisible = 1;
+        sprite->invisible = TRUE;
         taskId = CreateTask(sub_819F69C, 1);
         gTasks[taskId].data[7] = sprite->data[7];
         gTasks[taskId].func(taskId);
@@ -4058,7 +4058,7 @@ static void sub_819F7B4(u8 taskId)
     default:
         HideBg(3);
         gSprites[task->data[6]].data[7] = task->data[7];
-        gSprites[task->data[6]].invisible = 0;
+        gSprites[task->data[6]].invisible = FALSE;
         gSprites[task->data[6]].callback = sub_819F654;
         StartSpriteAffineAnim(&gSprites[task->data[6]], 1);
         ClearGpuRegBits(REG_OFFSET_DISPCNT, DISPCNT_WIN0_ON);
diff --git a/src/battle_gfx_sfx_util.c b/src/battle_gfx_sfx_util.c
index 8f17d488e..23ed8a19f 100644
--- a/src/battle_gfx_sfx_util.c
+++ b/src/battle_gfx_sfx_util.c
@@ -1173,7 +1173,7 @@ void SpriteCB_EnemyShadow(struct Sprite *shadowSprite)
 
 void SpriteCB_SetInvisible(struct Sprite *sprite)
 {
-    sprite->invisible = 1;
+    sprite->invisible = TRUE;
 }
 
 void SetBattlerShadowSpriteCallback(u8 battlerId, u16 species)
diff --git a/src/battle_interface.c b/src/battle_interface.c
index e45af2bf0..d2750bf9d 100644
--- a/src/battle_interface.c
+++ b/src/battle_interface.c
@@ -974,13 +974,13 @@ u8 CreateBattlerHealthboxSprites(u8 battlerId)
 
     gSprites[healthboxLeftSpriteId].hMain_HealthBarSpriteId = healthbarSpriteId;
     gSprites[healthboxLeftSpriteId].hMain_Battler = battlerId;
-    gSprites[healthboxLeftSpriteId].invisible = 1;
+    gSprites[healthboxLeftSpriteId].invisible = TRUE;
 
-    gSprites[healthboxRightSpriteId].invisible = 1;
+    gSprites[healthboxRightSpriteId].invisible = TRUE;
 
     healthBarSpritePtr->hBar_HealthBoxSpriteId = healthboxLeftSpriteId;
     healthBarSpritePtr->hBar_Data6 = data6;
-    healthBarSpritePtr->invisible = 1;
+    healthBarSpritePtr->invisible = TRUE;
 
     return healthboxLeftSpriteId;
 }
@@ -1058,16 +1058,16 @@ void SetBattleBarStruct(u8 battlerId, u8 healthboxSpriteId, s32 maxVal, s32 oldV
 
 void SetHealthboxSpriteInvisible(u8 healthboxSpriteId)
 {
-    gSprites[healthboxSpriteId].invisible = 1;
-    gSprites[gSprites[healthboxSpriteId].hMain_HealthBarSpriteId].invisible = 1;
-    gSprites[gSprites[healthboxSpriteId].oam.affineParam].invisible = 1;
+    gSprites[healthboxSpriteId].invisible = TRUE;
+    gSprites[gSprites[healthboxSpriteId].hMain_HealthBarSpriteId].invisible = TRUE;
+    gSprites[gSprites[healthboxSpriteId].oam.affineParam].invisible = TRUE;
 }
 
 void SetHealthboxSpriteVisible(u8 healthboxSpriteId)
 {
-    gSprites[healthboxSpriteId].invisible = 0;
-    gSprites[gSprites[healthboxSpriteId].hMain_HealthBarSpriteId].invisible = 0;
-    gSprites[gSprites[healthboxSpriteId].oam.affineParam].invisible = 0;
+    gSprites[healthboxSpriteId].invisible = FALSE;
+    gSprites[gSprites[healthboxSpriteId].hMain_HealthBarSpriteId].invisible = FALSE;
+    gSprites[gSprites[healthboxSpriteId].oam.affineParam].invisible = FALSE;
 }
 
 static void UpdateSpritePos(u8 spriteId, s16 x, s16 y)
diff --git a/src/berry_tag_screen.c b/src/berry_tag_screen.c
index d30af944e..07fb6bd9e 100644
--- a/src/berry_tag_screen.c
+++ b/src/berry_tag_screen.c
@@ -477,29 +477,29 @@ static void SetFlavorCirclesVisiblity(void)
     const struct Berry *berry = GetBerryInfo(sBerryTag->berryId);
 
     if (berry->spicy)
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SPICY]].invisible = 0;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SPICY]].invisible = FALSE;
     else
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SPICY]].invisible = 1;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SPICY]].invisible = TRUE;
 
     if (berry->dry)
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_DRY]].invisible = 0;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_DRY]].invisible = FALSE;
     else
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_DRY]].invisible = 1;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_DRY]].invisible = TRUE;
 
     if (berry->sweet)
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SWEET]].invisible = 0;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SWEET]].invisible = FALSE;
     else
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SWEET]].invisible = 1;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SWEET]].invisible = TRUE;
 
     if (berry->bitter)
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_BITTER]].invisible = 0;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_BITTER]].invisible = FALSE;
     else
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_BITTER]].invisible = 1;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_BITTER]].invisible = TRUE;
 
     if (berry->sour)
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SOUR]].invisible = 0;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SOUR]].invisible = FALSE;
     else
-        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SOUR]].invisible = 1;
+        gSprites[sBerryTag->flavorCircleIds[FLAVOR_SOUR]].invisible = TRUE;
 }
 
 static void DestroyFlavorCircleSprites(void)
diff --git a/src/credits.c b/src/credits.c
index 94089a6d1..981b60a47 100644
--- a/src/credits.c
+++ b/src/credits.c
@@ -1862,8 +1862,8 @@ static void sub_817664C(u8 data, u8 taskIdA)
     switch (data)
     {
     case 0:
-        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = 0;
-        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = 0;
+        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = FALSE;
+        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = FALSE;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.x = 272;
         gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].pos1.x = 272;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.y = 46;
@@ -1873,8 +1873,8 @@ static void sub_817664C(u8 data, u8 taskIdA)
         gTasks[taskIdA].data[TDA_0] = sub_817B3DC(0, 0x2000, 0x20, 8);
         break;
     case 1:
-        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = 0;
-        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = 0;
+        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = FALSE;
+        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = FALSE;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.x = 120;
         gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].pos1.x = 272;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.y = 46;
@@ -1884,8 +1884,8 @@ static void sub_817664C(u8 data, u8 taskIdA)
         gTasks[taskIdA].data[TDA_0] = sub_817B3DC(0, 0x2000, 0x20, 8);
         break;
     case 2:
-        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = 0;
-        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = 0;
+        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = FALSE;
+        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = FALSE;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.x = 120;
         gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].pos1.x = 272;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.y = 46;
@@ -1895,8 +1895,8 @@ static void sub_817664C(u8 data, u8 taskIdA)
         gTasks[taskIdA].data[TDA_0] = sub_817B3DC(1, 0x2000, 0x200, 8);
         break;
     case 3:
-        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = 0;
-        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = 0;
+        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = FALSE;
+        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = FALSE;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.x = 120;
         gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].pos1.x = -32;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.y = 46;
@@ -1906,8 +1906,8 @@ static void sub_817664C(u8 data, u8 taskIdA)
         gTasks[taskIdA].data[TDA_0] = sub_817B3DC(1, 0x2000, 0x200, 8);
         break;
     case 4:
-        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = 0;
-        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = 0;
+        gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].invisible = FALSE;
+        gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].invisible = FALSE;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.x = 88;
         gSprites[gTasks[taskIdA].data[TDA_RIVAL_CYCLIST]].pos1.x = 152;
         gSprites[gTasks[taskIdA].data[TDA_PLAYER_CYCLIST]].pos1.y = 46;
diff --git a/src/egg_hatch.c b/src/egg_hatch.c
index d56f03028..9f2526295 100644
--- a/src/egg_hatch.c
+++ b/src/egg_hatch.c
@@ -451,7 +451,7 @@ static u8 EggHatchCreateMonSprite(u8 a0, u8 switchID, u8 pokeID, u16* speciesLoc
     case 1:
         SetMultiuseSpriteTemplateToPokemon(GetMonSpritePalStruct(mon)->tag, r5);
         spriteID = CreateSprite(&gMultiuseSpriteTemplate, 120, 75, 6);
-        gSprites[spriteID].invisible = 1;
+        gSprites[spriteID].invisible = TRUE;
         gSprites[spriteID].callback = SpriteCallbackDummy;
         break;
     }
@@ -808,7 +808,7 @@ static void SpriteCB_Egg_4(struct Sprite* sprite)
     if (!gPaletteFade.active)
     {
         PlaySE(SE_TAMAGO);
-        sprite->invisible = 1;
+        sprite->invisible = TRUE;
         sprite->callback = SpriteCB_Egg_5;
         sprite->data[0] = 0;
     }
@@ -818,7 +818,7 @@ static void SpriteCB_Egg_5(struct Sprite* sprite)
 {
     if (sprite->data[0] == 0)
     {
-        gSprites[sEggHatchData->pokeSpriteID].invisible = 0;
+        gSprites[sEggHatchData->pokeSpriteID].invisible = FALSE;
         StartSpriteAffineAnim(&gSprites[sEggHatchData->pokeSpriteID], 1);
     }
     if (sprite->data[0] == 8)
diff --git a/src/event_object_movement.c b/src/event_object_movement.c
index 7f76bb168..2b85e751f 100644
--- a/src/event_object_movement.c
+++ b/src/event_object_movement.c
@@ -1097,13 +1097,13 @@ static void sub_808D450(void)
     gSprites[spriteId].oam.affineMode = 1;
     InitSpriteAffineAnim(&gSprites[spriteId]);
     StartSpriteAffineAnim(&gSprites[spriteId], 0);
-    gSprites[spriteId].invisible = 1;
+    gSprites[spriteId].invisible = TRUE;
 
     spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[21], 0, 0, 31);
     gSprites[spriteId].oam.affineMode = 1;
     InitSpriteAffineAnim(&gSprites[spriteId]);
     StartSpriteAffineAnim(&gSprites[spriteId], 1);
-    gSprites[spriteId].invisible = 1;
+    gSprites[spriteId].invisible = TRUE;
 }
 
 u8 GetFirstInactiveEventObjectId(void)
@@ -8798,9 +8798,9 @@ void UpdateEventObjectSpriteVisibility(struct Sprite *sprite, bool8 invisible)
     y2 = y - (sprite->centerToCornerVecY >> 1);
 
     if ((s16)x > 255 || x2 < -16)
-        sprite->invisible = 1;
+        sprite->invisible = TRUE;
     if ((s16)y > 175 || y2 < -16)
-        sprite->invisible = 1;
+        sprite->invisible = TRUE;
 }
 
 void UpdateEventObjectSpriteSubpriorityAndVisibility(struct Sprite *sprite)
diff --git a/src/evolution_graphics.c b/src/evolution_graphics.c
index 8d02eef91..77f65289e 100644
--- a/src/evolution_graphics.c
+++ b/src/evolution_graphics.c
@@ -220,10 +220,10 @@ static void SpriteCB_PostEvoSparkleSet2(struct Sprite* sprite)
             sprite->subpriority = 1;
         else
         {
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
             sprite->subpriority = 20;
             if (sprite->data[6] > 112 && sprite->data[6] & 1)
-                sprite->invisible = 1;
+                sprite->invisible = TRUE;
         }
         if (matrixNum < 20)
             matrixNum = 20;
@@ -498,13 +498,13 @@ u8 sub_817C3A0(u8 preEvoSpriteID, u8 postEvoSpriteID)
     gSprites[preEvoSpriteID].callback = PokeEvoSprite_DummySpriteCB;
     gSprites[preEvoSpriteID].oam.affineMode = 1;
     gSprites[preEvoSpriteID].oam.matrixNum = 30;
-    gSprites[preEvoSpriteID].invisible = 0;
+    gSprites[preEvoSpriteID].invisible = FALSE;
     CpuSet(stack, &gPlttBufferFaded[0x100 + (gSprites[preEvoSpriteID].oam.paletteNum * 16)], 16);
 
     gSprites[postEvoSpriteID].callback = PokeEvoSprite_DummySpriteCB;
     gSprites[postEvoSpriteID].oam.affineMode = 1;
     gSprites[postEvoSpriteID].oam.matrixNum = 31;
-    gSprites[postEvoSpriteID].invisible = 0;
+    gSprites[postEvoSpriteID].invisible = FALSE;
     CpuSet(stack, &gPlttBufferFaded[0x100 + (gSprites[postEvoSpriteID].oam.paletteNum * 16)], 16);
 
     gTasks[taskID].tEvoStopped = FALSE;
@@ -588,11 +588,11 @@ static void PreEvoInvisible_PostEvoVisible_KillTask(u8 taskID)
 {
     gSprites[gTasks[taskID].tPreEvoSpriteID].oam.affineMode = 0;
     gSprites[gTasks[taskID].tPreEvoSpriteID].oam.matrixNum = 0;
-    gSprites[gTasks[taskID].tPreEvoSpriteID].invisible = 1;
+    gSprites[gTasks[taskID].tPreEvoSpriteID].invisible = TRUE;
 
     gSprites[gTasks[taskID].tPostEvoSpriteID].oam.affineMode = 0;
     gSprites[gTasks[taskID].tPostEvoSpriteID].oam.matrixNum = 0;
-    gSprites[gTasks[taskID].tPostEvoSpriteID].invisible = 0;
+    gSprites[gTasks[taskID].tPostEvoSpriteID].invisible = FALSE;
 
     DestroyTask(taskID);
 }
@@ -601,11 +601,11 @@ static void PreEvoVisible_PostEvoInvisible_KillTask(u8 taskID)
 {
     gSprites[gTasks[taskID].tPreEvoSpriteID].oam.affineMode = 0;
     gSprites[gTasks[taskID].tPreEvoSpriteID].oam.matrixNum = 0;
-    gSprites[gTasks[taskID].tPreEvoSpriteID].invisible = 0;
+    gSprites[gTasks[taskID].tPreEvoSpriteID].invisible = FALSE;
 
     gSprites[gTasks[taskID].tPostEvoSpriteID].oam.affineMode = 0;
     gSprites[gTasks[taskID].tPostEvoSpriteID].oam.matrixNum = 0;
-    gSprites[gTasks[taskID].tPostEvoSpriteID].invisible = 1;
+    gSprites[gTasks[taskID].tPostEvoSpriteID].invisible = TRUE;
 
     DestroyTask(taskID);
 }
diff --git a/src/evolution_scene.c b/src/evolution_scene.c
index ae15e79fe..91ac90b1b 100644
--- a/src/evolution_scene.c
+++ b/src/evolution_scene.c
@@ -285,7 +285,7 @@ void EvolutionScene(struct Pokemon* mon, u16 speciesToEvolve, bool8 canStopEvo,
 
     gSprites[ID].callback = SpriteCallbackDummy_2;
     gSprites[ID].oam.paletteNum = 1;
-    gSprites[ID].invisible = 1;
+    gSprites[ID].invisible = TRUE;
 
     // postEvo sprite
     DecompressPicFromTable_2(&gMonFrontPicTable[speciesToEvolve],
@@ -299,7 +299,7 @@ void EvolutionScene(struct Pokemon* mon, u16 speciesToEvolve, bool8 canStopEvo,
     sEvoStructPtr->postEvoSpriteID = ID = CreateSprite(&gMultiuseSpriteTemplate, 120, 64, 30);
     gSprites[ID].callback = SpriteCallbackDummy_2;
     gSprites[ID].oam.paletteNum = 2;
-    gSprites[ID].invisible = 1;
+    gSprites[ID].invisible = TRUE;
 
     LoadEvoSparkleSpriteAndPal();
 
@@ -514,7 +514,7 @@ void TradeEvolutionScene(struct Pokemon* mon, u16 speciesToEvolve, u8 preEvoSpri
 
     gSprites[ID].callback = SpriteCallbackDummy_2;
     gSprites[ID].oam.paletteNum = 2;
-    gSprites[ID].invisible = 1;
+    gSprites[ID].invisible = TRUE;
 
     LoadEvoSparkleSpriteAndPal();
 
@@ -623,7 +623,7 @@ static void Task_EvolutionScene(u8 taskID)
     {
     case 0:
         BeginNormalPaletteFade(0xFFFFFFFF, 0, 0x10, 0, 0);
-        gSprites[sEvoStructPtr->preEvoSpriteID].invisible = 0;
+        gSprites[sEvoStructPtr->preEvoSpriteID].invisible = FALSE;
         gTasks[taskID].tState++;
         ShowBg(0);
         ShowBg(1);
diff --git a/src/field_effect.c b/src/field_effect.c
index ecda8578b..e7ecca183 100644
--- a/src/field_effect.c
+++ b/src/field_effect.c
@@ -1078,7 +1078,7 @@ u8 PokecenterHealEffectHelper(s16 x, s16 y)
     spriteIdAtEnd = CreateSpriteAtEnd(&gSpriteTemplate_855C31C, x, y, 0);
     sprite = &gSprites[spriteIdAtEnd];
     sprite->oam.priority = 2;
-    sprite->invisible = 1;
+    sprite->invisible = TRUE;
     SetSubspriteTables(sprite, &gUnknown_0855C2AC);
     return spriteIdAtEnd;
 }
@@ -1088,7 +1088,7 @@ void SpriteCB_PokecenterMonitor(struct Sprite *sprite)
     if (sprite->data[0] != 0)
     {
         sprite->data[0] = 0;
-        sprite->invisible = 0;
+        sprite->invisible = FALSE;
         StartSpriteAnim(sprite, 1);
     }
     if (sprite->animEnded)
@@ -1108,7 +1108,7 @@ void HallOfFameRecordEffectHelper(s16 a0, s16 a1, s16 a2, u8 a3)
     {
         spriteIdAtEnd = CreateSpriteAtEnd(&gSpriteTemplate_855C34C, a1, a2, 0);
     }
-    gSprites[spriteIdAtEnd].invisible = 1;
+    gSprites[spriteIdAtEnd].invisible = TRUE;
     gSprites[spriteIdAtEnd].data[0] = a0;
 }
 
@@ -1182,7 +1182,7 @@ void mapldr_08084390(void)
     Overworld_PlaySpecialMapMusic();
     pal_fill_black();
     CreateTask(c3_080843F8, 0);
-    gEventObjects[gPlayerAvatar.eventObjectId].invisible = 1;
+    gEventObjects[gPlayerAvatar.eventObjectId].invisible = TRUE;
     if (gPlayerAvatar.flags & 0x08)
     {
         EventObjectTurn(&gEventObjects[gPlayerAvatar.eventObjectId], DIR_WEST);
@@ -1242,7 +1242,7 @@ bool8 sub_80B6BCC(struct Task *task) // gUnknown_0855C3C8[0]
     playerObject = &gEventObjects[gPlayerAvatar.eventObjectId];
     playerSprite = &gSprites[gPlayerAvatar.spriteId];
     CameraObjectReset2();
-    gEventObjects[gPlayerAvatar.eventObjectId].invisible = 1;
+    gEventObjects[gPlayerAvatar.eventObjectId].invisible = TRUE;
     gPlayerAvatar.preventStep = TRUE;
     EventObjectSetHeldMovement(playerObject, GetFaceDirectionMovementAction(GetPlayerFacingDirection()));
     task->data[4] = playerSprite->subspriteMode;
@@ -1271,7 +1271,7 @@ bool8 sub_80B6C90(struct Task *task) // gUnknown_0855C3C8[2]
     sprite->pos2.y = -(sprite->pos1.y + sprite->centerToCornerVecY + gSpriteCoordOffsetY + centerToCornerVecY);
     task->data[1] = 1;
     task->data[2] = 0;
-    gEventObjects[gPlayerAvatar.eventObjectId].invisible = 0;
+    gEventObjects[gPlayerAvatar.eventObjectId].invisible = FALSE;
     PlaySE(SE_RU_HYUU);
     task->data[0]++;
     return FALSE;
@@ -1869,7 +1869,7 @@ bool8 sub_80B78EC(struct Task *task, struct EventObject *eventObject, struct Spr
     CameraObjectReset2();
     FreezeEventObjects();
     gPlayerAvatar.preventStep = TRUE;
-    eventObject->invisible = 1;
+    eventObject->invisible = TRUE;
     task->data[0]++;
     return FALSE;
 }
@@ -1894,7 +1894,7 @@ bool8 sub_80B7968(struct Task *task, struct EventObject *eventObject, struct Spr
     if (sprite->animCmdIndex > 1)
     {
         task->data[0]++;
-        eventObject->invisible = 0;
+        eventObject->invisible = FALSE;
         CameraObjectReset1();
         PlaySE(SE_W091);
         EventObjectSetHeldMovement(eventObject, GetJumpMovementAction(DIR_EAST));
@@ -1982,7 +1982,7 @@ bool8 sub_80B7B94(struct Task *task, struct EventObject *eventObject, struct Spr
 {
     if (gSprites[task->data[1]].animCmdIndex == 2)
     {
-        eventObject->invisible = 1;
+        eventObject->invisible = TRUE;
         task->data[0]++;
     }
     return FALSE;
@@ -2097,7 +2097,7 @@ void mapldr_080859D4(void)
     ScriptContext2_Enable();
     FreezeEventObjects();
     gFieldCallback = NULL;
-    gEventObjects[gPlayerAvatar.eventObjectId].invisible = 1;
+    gEventObjects[gPlayerAvatar.eventObjectId].invisible = TRUE;
     CreateTask(sub_80B7E94, 0);
 }
 
@@ -2127,7 +2127,7 @@ void sub_80B7EE8(struct Task *task)
         }
         if (task->data[2] >= 32 && task->data[15] == GetPlayerFacingDirection())
         {
-            eventObject->invisible = 0;
+            eventObject->invisible = FALSE;
             ScriptContext2_Disable();
             UnfreezeEventObjects();
             DestroyTask(FindTaskIdByFunc(sub_80B7E94));
@@ -2254,7 +2254,7 @@ static void mapldr_08085D88(void)
     ScriptContext2_Enable();
     FreezeEventObjects();
     gFieldCallback = NULL;
-    gEventObjects[gPlayerAvatar.eventObjectId].invisible = 1;
+    gEventObjects[gPlayerAvatar.eventObjectId].invisible = TRUE;
     CameraObjectReset2();
     CreateTask(sub_80B8250, 0);
 }
@@ -2279,7 +2279,7 @@ void sub_80B8280(struct Task *task)
         sprite = &gSprites[gPlayerAvatar.spriteId];
         centerToCornerVecY = -(sprite->centerToCornerVecY << 1);
         sprite->pos2.y = -(sprite->pos1.y + sprite->centerToCornerVecY + gSpriteCoordOffsetY + centerToCornerVecY);
-        gEventObjects[gPlayerAvatar.eventObjectId].invisible = 0;
+        gEventObjects[gPlayerAvatar.eventObjectId].invisible = FALSE;
         task->data[0]++;
         task->data[1] = 8;
         task->data[2] = 1;
@@ -3463,7 +3463,7 @@ void sub_80B96B0(struct Sprite *sprite)
             sprite->data[7]++;
             sprite->oam.affineMode = 0;
             FreeOamMatrix(sprite->oam.matrixNum);
-            sprite->invisible = 1;
+            sprite->invisible = TRUE;
         }
     }
 }
@@ -3516,7 +3516,7 @@ void sub_80B9804(struct Task *task)
         CameraObjectReset2();
         EventObjectTurn(eventObject, DIR_WEST);
         StartSpriteAnim(&gSprites[eventObject->spriteId], 0x16);
-        eventObject->invisible = 0;
+        eventObject->invisible = FALSE;
         task->data[1] = sub_80B94C4();
         sub_80B9524(task->data[1]);
         sub_80B9560(task->data[1], eventObject->spriteId);
diff --git a/src/item_menu.c b/src/item_menu.c
index 938277210..0cdedec97 100755
--- a/src/item_menu.c
+++ b/src/item_menu.c
@@ -1185,7 +1185,7 @@ void SwitchBagPocket(u8 taskId, s16 deltaBagPocketId, u16 a3)
         ClearWindowTilemap(1);
         DestroyListMenuTask(data[0], &gUnknown_0203CE58.scrollPosition[gUnknown_0203CE58.pocket], &gUnknown_0203CE58.cursorPosition[gUnknown_0203CE58.pocket]);
         schedule_bg_copy_tilemap_to_vram(0);
-        gSprites[gUnknown_0203CE54->unk804[2 + (gUnknown_0203CE54->unk81B_1 ^ 1)]].invisible = 1;
+        gSprites[gUnknown_0203CE54->unk804[2 + (gUnknown_0203CE54->unk81B_1 ^ 1)]].invisible = TRUE;
         sub_81AB824();
     }
     pocketId = gUnknown_0203CE58.pocket;
diff --git a/src/main_menu.c b/src/main_menu.c
index fd8b1b04d..7e84ae7ec 100644
--- a/src/main_menu.c
+++ b/src/main_menu.c
@@ -1164,7 +1164,7 @@ void task_new_game_prof_birch_speech_2(u8 taskId)
         spriteId = gTasks[taskId].data[8];
         gSprites[spriteId].pos1.x = 0x88;
         gSprites[spriteId].pos1.y = 0x3C;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gSprites[spriteId].oam.objMode = 1;
         sub_8031BAC(taskId, 10);
         sub_8031D34(taskId, 20);
@@ -1225,7 +1225,7 @@ void sub_8030A70(u8 taskId)
 
     gSprites[spriteId].pos1.x = 0x64;
     gSprites[spriteId].pos1.y = 0x4B;
-    gSprites[spriteId].invisible = 0;
+    gSprites[spriteId].invisible = FALSE;
     gSprites[spriteId].data[0] = 0;
 
     CreatePokeballSpriteToReleaseMon(spriteId, gSprites[spriteId].oam.paletteNum, 0x70, 0x3A, 0, 0, 0x20, 0xFFFF, SPECIES_LOTAD);
@@ -1306,8 +1306,8 @@ void task_new_game_prof_birch_speech_9(u8 taskId)
 {
     if (gTasks[taskId].data[5])
     {
-        gSprites[gTasks[taskId].data[8]].invisible = 1;
-        gSprites[gTasks[taskId].data[9]].invisible = 1;
+        gSprites[gTasks[taskId].data[8]].invisible = TRUE;
+        gSprites[gTasks[taskId].data[9]].invisible = TRUE;
         if (gTasks[taskId].data[7])
         {
             gTasks[taskId].data[7]--;
@@ -1318,7 +1318,7 @@ void task_new_game_prof_birch_speech_9(u8 taskId)
 
             gSprites[spriteId].pos1.x = 0xB4;
             gSprites[spriteId].pos1.y = 0x3C;
-            gSprites[spriteId].invisible = 0;
+            gSprites[spriteId].invisible = FALSE;
             gSprites[spriteId].oam.objMode = 1;
             gTasks[taskId].data[2] = spriteId;
             gTasks[taskId].data[6] = 0;
@@ -1394,14 +1394,14 @@ void sub_8030ED4(u8 taskId)
     }
     else
     {
-        gSprites[spriteId].invisible = 1;
+        gSprites[spriteId].invisible = TRUE;
         if (gTasks[taskId].data[6])
             spriteId = gTasks[taskId].data[11];
         else
             spriteId = gTasks[taskId].data[10];
         gSprites[spriteId].pos1.x = 0xF0;
         gSprites[spriteId].pos1.y = 0x3C;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gTasks[taskId].data[2] = spriteId;
         gSprites[spriteId].oam.objMode = 1;
         sub_8031BAC(taskId, 0);
@@ -1562,8 +1562,8 @@ void task_new_game_prof_birch_speech_part2_8(u8 taskId)
 
     if (gTasks[taskId].data[5])
     {
-        gSprites[gTasks[taskId].data[8]].invisible = 1;
-        gSprites[gTasks[taskId].data[9]].invisible = 1;
+        gSprites[gTasks[taskId].data[8]].invisible = TRUE;
+        gSprites[gTasks[taskId].data[9]].invisible = TRUE;
         if (gTasks[taskId].data[7])
         {
             gTasks[taskId].data[7]--;
@@ -1575,7 +1575,7 @@ void task_new_game_prof_birch_speech_part2_8(u8 taskId)
             spriteId = gTasks[taskId].data[10];
         gSprites[spriteId].pos1.x = 0x78;
         gSprites[spriteId].pos1.y = 0x3C;
-        gSprites[spriteId].invisible = 0;
+        gSprites[spriteId].invisible = FALSE;
         gSprites[spriteId].oam.objMode = 1;
         gTasks[taskId].data[2] = spriteId;
         sub_8031BAC(taskId, 2);
@@ -1692,7 +1692,7 @@ void new_game_prof_birch_speech_part2_start(void)
     }
     gSprites[spriteId].pos1.x = 0xB4;
     gSprites[spriteId].pos1.y = 0x3C;
-    gSprites[spriteId].invisible = 0;
+    gSprites[spriteId].invisible = FALSE;
     gTasks[taskId].data[2] = spriteId;
     SetGpuReg(REG_OFFSET_BG1HOFS, -60);
     BeginNormalPaletteFade(0xFFFFFFFF, 0, 16, 0, 0);
diff --git a/src/menu_helpers.c b/src/menu_helpers.c
index 0f6d5aa38..8cabbde42 100644
--- a/src/menu_helpers.c
+++ b/src/menu_helpers.c
@@ -410,7 +410,7 @@ void sub_8122344(u8 *spriteIds, u8 count)
         if (i != 0)
             StartSpriteAnim(&gSprites[spriteIds[i]], 1);
 
-        gSprites[spriteIds[i]].invisible = 1;
+        gSprites[spriteIds[i]].invisible = TRUE;
     }
 }
 
diff --git a/src/pokemon_animation.c b/src/pokemon_animation.c
index 9c307f7f8..e75f2eeba 100644
--- a/src/pokemon_animation.c
+++ b/src/pokemon_animation.c
@@ -2347,7 +2347,7 @@ static void pokemonanimfunc_27(struct Sprite *sprite)
         sprite->invisible = sprite->data[4];
         if (++sprite->data[2] > 19)
         {
-            sprite->invisible = 0;
+            sprite->invisible = FALSE;
             sprite->callback = SpriteCB_SetDummyOnAnimEnd;
         }
         sprite->data[3] = 2;
@@ -3069,17 +3069,17 @@ static void pokemonanimfunc_35(struct Sprite *sprite)
     {
         sprite->data[7] = 0;
         sprite->data[2]++;
-        sprite->invisible = 0;
+        sprite->invisible = FALSE;
     }
     else
     {
         sprite->data[7]++;
-        sprite->invisible = 1;
+        sprite->invisible = TRUE;
     }
 
     if (sprite->data[2] > 10)
     {
-        sprite->invisible = 0;
+        sprite->invisible = FALSE;
         sprite->callback = SpriteCB_SetDummyOnAnimEnd;
     }
 }
diff --git a/src/rom_8034C54.c b/src/rom_8034C54.c
index 42df51295..da18c330c 100644
--- a/src/rom_8034C54.c
+++ b/src/rom_8034C54.c
@@ -442,7 +442,7 @@ static void sub_8035608(void)
 
     ResetSpriteData();
     spriteId = CreateSprite(&gUnknown_0831AC88, 0, 0, 0);
-    gSprites[spriteId].invisible = 1;
+    gSprites[spriteId].invisible = TRUE;
     SetMainCallback2(sub_8035648);
 }
 
diff --git a/src/sprite.c b/src/sprite.c
index 8a4729b27..c133dc73e 100644
--- a/src/sprite.c
+++ b/src/sprite.c
@@ -171,7 +171,7 @@ static const struct Sprite sDummySprite =
     .data = {0, 0, 0, 0, 0, 0, 0},
     .inUse = 0,
     .coordOffsetEnabled = 0,
-    .invisible = 0,
+    .invisible = FALSE,
     .flags_3 = 0,
     .flags_4 = 0,
     .flags_5 = 0,