diff --git a/src/BossAlmo1.cpp b/src/BossAlmo1.cpp
index e8feb8f5..e5b2d5be 100644
--- a/src/BossAlmo1.cpp
+++ b/src/BossAlmo1.cpp
@@ -137,8 +137,8 @@ static void ActBossChar_Core_Mini(NPCHAR *npc)
 			npc->bits |= NPC_SHOOTABLE;
 			// Fallthrough
 		case 101:
-			npc->x += (npc->tgt_x - npc->x) / 16;
-			npc->y += (npc->tgt_y - npc->y) / 16;
+			npc->x += (npc->tgt_x - npc->x) / 0x10;
+			npc->y += (npc->tgt_y - npc->y) / 0x10;
 
 			if (++npc->act_wait > 50)
 				npc->ani_no = 0;
@@ -168,8 +168,8 @@ static void ActBossChar_Core_Mini(NPCHAR *npc)
 			npc->tgt_y = npc->y + (Random(-4, 4) * 0x200);
 			// Fallthrough
 		case 131:
-			npc->x += (npc->tgt_x - npc->x) / 16;
-			npc->y += (npc->tgt_y - npc->y) / 16;
+			npc->x += (npc->tgt_x - npc->x) / 0x10;
+			npc->y += (npc->tgt_y - npc->y) / 0x10;
 
 			if (++npc->act_wait > 50)
 			{
@@ -190,8 +190,8 @@ static void ActBossChar_Core_Mini(NPCHAR *npc)
 			break;
 
 		case 140:
-			npc->x += (npc->tgt_x - npc->x) / 16;
-			npc->y += (npc->tgt_y - npc->y) / 16;
+			npc->x += (npc->tgt_x - npc->x) / 0x10;
+			npc->y += (npc->tgt_y - npc->y) / 0x10;
 			break;
 
 		case 200:
@@ -224,14 +224,17 @@ static void ActBossChar_Core_Hit(NPCHAR *npc)
 			npc->x = gBoss[0].x;
 			npc->y = gBoss[0].y - 0x4000;
 			break;
+
 		case 1:
 			npc->x = gBoss[0].x + 0x3800;
 			npc->y = gBoss[0].y;
 			break;
+
 		case 2:
 			npc->x = gBoss[0].x + 0x800;
 			npc->y = gBoss[0].y + 0x4000;
 			break;
+
 		case 3:
 			npc->x = gBoss[0].x - 0x3800;
 			npc->y = gBoss[0].y + 0x800;
@@ -423,7 +426,7 @@ void ActBossChar_Core(void)
 			// Fallthrough
 		case 221:
 			++npc->act_wait;
-			SetNpChar(199, gMC.x + (Random(-50, 150) * 0x200 * 2), gMC.y + (Random(-0xA0, 0xA0) * 0x200), 0, 0, 0, 0, 0x100);
+			SetNpChar(199, gMC.x + (Random(-50, 150) * 0x200 * 2), gMC.y + (Random(-160, 160) * 0x200), 0, 0, 0, 0, 0x100);
 			gMC.xm -= 0x20;
 			gMC.cond |= 0x20;
 
diff --git a/src/BossAlmo2.cpp b/src/BossAlmo2.cpp
index c02f99f6..046e6848 100644
--- a/src/BossAlmo2.cpp
+++ b/src/BossAlmo2.cpp
@@ -532,18 +532,23 @@ void ActBossChar_Undead(void)
 		case 230:
 			npc->act_no = 231;
 			npc->act_wait = 0;
+
 			gBoss[3].act_no = 30;
+
 			gBoss[8].bits |= NPC_INVULNERABLE;
 			gBoss[9].bits |= NPC_INVULNERABLE;
 			gBoss[10].bits |= NPC_INVULNERABLE;
 			gBoss[11].bits |= NPC_SHOOTABLE;
+
 			PlaySoundObject(25, 1);
+
 			SetNpChar(285, gBoss[3].x - 0x2000, gBoss[3].y, 0, 0, 0, 0, 0x100);
 			SetNpChar(285, gBoss[3].x - 0x2000, gBoss[3].y, 0, 0, 0x400, 0, 0x100);
 			SetNpChar(285, gBoss[3].x, gBoss[3].y - 0x2000, 0, 0, 0, 0, 0x100);
 			SetNpChar(285, gBoss[3].x, gBoss[3].y - 0x2000, 0, 0, 0x400, 0, 0x100);
 			SetNpChar(285, gBoss[3].x, gBoss[3].y + 0x2000, 0, 0, 0, 0, 0x100);
 			SetNpChar(285, gBoss[3].x, gBoss[3].y + 0x2000, 0, 0, 0x400, 0, 0x100);
+
 			life = npc->life;
 			bShock = TRUE;
 			// Fallthrough
@@ -719,12 +724,16 @@ void ActBossChar_Undead(void)
 	npc->y += npc->ym;
 
 	ActBossCharA_Face(&gBoss[3]);
+
 	ActBossCharA_Head(&gBoss[4]);
+
 	ActBossCharA_Tail(&gBoss[5]);
+
 	ActBossCharA_Mini(&gBoss[1]);
 	ActBossCharA_Mini(&gBoss[2]);
 	ActBossCharA_Mini(&gBoss[6]);
 	ActBossCharA_Mini(&gBoss[7]);
+
 	ActBossCharA_Hit(&gBoss[8]);
 	ActBossCharA_Hit(&gBoss[9]);
 	ActBossCharA_Hit(&gBoss[10]);
diff --git a/src/BossBallos.cpp b/src/BossBallos.cpp
index 8e441dc6..de2025e7 100644
--- a/src/BossBallos.cpp
+++ b/src/BossBallos.cpp
@@ -117,13 +117,13 @@ static void ActBossChar_Body(NPCHAR *npc)
 	npc->rect = rc[npc->ani_no];
 }
 
-static void ActBossChar_HITAI(NPCHAR *npc)
+static void ActBossChar_HITAI(NPCHAR *npc)	// "Hitai" = "forehead" or "brow" (according to Google Translate, anyway)
 {
 	npc->x = gBoss[0].x;
 	npc->y = gBoss[0].y - 0x5800;
 }
 
-static void ActBossChar_HARA(NPCHAR *npc)
+static void ActBossChar_HARA(NPCHAR *npc)	// "Hara" = "belly" or "stomach" (according to Google Translate, anyway)
 {
 	npc->x = gBoss[0].x;
 	npc->y = gBoss[0].y;
@@ -373,8 +373,8 @@ void ActBossChar_Ballos(void)
 
 			for (i = 0; i < 0x100; i += 0x40)
 			{
-				SetNpChar(342, npc->x, npc->y, 0, 0, i, npc, 0x5A);
-				SetNpChar(342, npc->x, npc->y, 0, 0, i + 544, npc, 0x5A);
+				SetNpChar(342, npc->x, npc->y, 0, 0, i, npc, 90);
+				SetNpChar(342, npc->x, npc->y, 0, 0, i + 544, npc, 90);
 			}
 
 			SetNpChar(343, npc->x, npc->y, 0, 0, 0, npc, 0x18);
@@ -641,6 +641,7 @@ void ActBossChar_Ballos(void)
 				gBoss[3].cond = 0;
 				gBoss[4].cond = 0;
 				gBoss[5].cond = 0;
+
 				DeleteNpCharCode(350, 1);
 				DeleteNpCharCode(348, 1);
 			}
diff --git a/src/BossFrog.cpp b/src/BossFrog.cpp
index 142b00ab..63177d27 100644
--- a/src/BossFrog.cpp
+++ b/src/BossFrog.cpp
@@ -147,7 +147,7 @@ void ActBossChar_Frog(void)
 			boss->ani_no = 3;
 			boss->cond = 0x80;
 			boss->rect = rcRight[0];
-			gBoss[1].cond = -112;
+			gBoss[1].cond = 0x90;
 			gBoss[1].code_event = 1000;
 			gBoss[2].cond = 0x80;
 			gBoss[1].damage = 5;
diff --git a/src/BossOhm.cpp b/src/BossOhm.cpp
index cc7d7289..36c58789 100644
--- a/src/BossOhm.cpp
+++ b/src/BossOhm.cpp
@@ -192,7 +192,7 @@ void ActBossChar_Omega()
 			SetQuake(2);
 			gBoss[0].y -= 0x200;
 
-			if (!(++gBoss[0].act_wait % 4))
+			if (++gBoss[0].act_wait % 4 == 0)
 				PlaySoundObject(26, 1);
 
 			if (gBoss[0].act_wait == 48)
@@ -273,7 +273,7 @@ void ActBossChar_Omega()
 			if (gBoss[0].count2 == 1)
 				gBoss[0].damage = 20;
 
-			if (!gBoss[0].count2)
+			if (gBoss[0].count2 == 0)
 			{
 				PlaySoundObject(102, 0);
 				PlaySoundObject(12, 1);
@@ -303,7 +303,7 @@ void ActBossChar_Omega()
 			SetQuake(2);
 			gBoss[0].y += 0x200;
 
-			if (!(++gBoss[0].act_wait % 4))
+			if (++gBoss[0].act_wait % 4 == 0)
 				PlaySoundObject(26, 1);
 
 			if (gBoss[0].act_wait == 48)
@@ -319,7 +319,7 @@ void ActBossChar_Omega()
 				gBoss[0].act_wait = 0;
 				gBoss[0].act_no = 30;
 
-				gBoss[0].x = gBoss[0].tgt_x + (Random(-64, 64) << 9);
+				gBoss[0].x = gBoss[0].tgt_x + (Random(-0x40, 0x40) * 0x200);
 				gBoss[0].y = gBoss[0].tgt_y;
 			}
 			break;
@@ -351,7 +351,7 @@ void ActBossChar_Omega()
 
 			if (gBoss[0].act_wait < 30 && !(gBoss[0].act_wait % 5))
 			{
-				SetNpChar(48, gBoss[0].x, gBoss[0].y - 0x2000, Random(-0x155, 0x155), -0x333, 0, NULL, 0x100);
+				SetNpChar(48, gBoss[0].x, gBoss[0].y - 0x2000, Random(-341, 341), -0x333, 0, NULL, 0x100);
 				PlaySoundObject(39, 1);
 			}
 			break;
@@ -422,10 +422,10 @@ void ActBossChar_Omega()
 		case 150:
 			SetQuake(2);
 
-			if (!(++gBoss[0].act_wait % 12))
+			if (++gBoss[0].act_wait % 12 == 0)
 				PlaySoundObject(52, 1);
 
-			SetDestroyNpChar(gBoss[0].x + (Random(-48, 48) << 9), gBoss[0].y + (Random(-48, 24) << 9), 1, 1);
+			SetDestroyNpChar(gBoss[0].x + (Random(-0x30, 0x30) * 0x200), gBoss[0].y + (Random(-0x30, 0x18) * 0x200), 1, 1);
 
 			if (gBoss[0].act_wait > 100)
 			{
@@ -449,9 +449,6 @@ void ActBossChar_Omega()
 				gBoss[5].cond = 0;
 			}
 			break;
-
-		default:
-			break;
 	}
 
 	RECT rect[4] = {
@@ -472,7 +469,7 @@ void ActBossChar_Omega()
 	ActBoss01_12();
 	ActBoss01_5();
 
-	if (!gBoss[0].life && gBoss[0].act_no < 150)
+	if (gBoss[0].life == 0 && gBoss[0].act_no < 150)
 	{
 		gBoss[0].act_no = 150;
 		gBoss[0].act_wait = 0;
diff --git a/src/BossPress.cpp b/src/BossPress.cpp
index 92fde880..ede88e51 100644
--- a/src/BossPress.cpp
+++ b/src/BossPress.cpp
@@ -74,7 +74,7 @@ void ActBossChar_Press(void)
 		case 30:
 			npc->act_no = 31;
 			npc->ani_no = 2;
-			npc->x = 81920;
+			npc->x = 0x14000;
 			npc->y = 0x8000;
 			// Fallthrough
 		case 31:
diff --git a/src/BossTwinD.cpp b/src/BossTwinD.cpp
index 1e042d4c..53e166ec 100644
--- a/src/BossTwinD.cpp
+++ b/src/BossTwinD.cpp
@@ -324,7 +324,7 @@ void ActBossChar_Twin(void)
 			break;
 
 		case 20:
-			if (--npc->tgt_x <= 112)
+			if (--npc->tgt_x <= 0x70)
 			{
 				npc->act_no = 100;
 				npc->act_wait = 0;
@@ -341,40 +341,28 @@ void ActBossChar_Twin(void)
 			{
 				++npc->count1;
 			}
+			else if (npc->act_wait < 120)
+			{
+				npc->count1 += 2;
+			}
+			else if (npc->act_wait < npc->count2)
+			{
+				npc->count1 += 4;
+			}
+			else if (npc->act_wait < npc->count2 + 40)
+			{
+				npc->count1 += 2;
+			}
+			else if (npc->act_wait < npc->count2 + 60)
+			{
+				++npc->count1;
+			}
 			else
 			{
-				if (npc->act_wait < 120)
-				{
-					npc->count1 += 2;
-				}
-				else
-				{
-					if (npc->act_wait < npc->count2)
-					{
-						npc->count1 += 4;
-					}
-					else
-					{
-						if (npc->act_wait < npc->count2 + 40)
-						{
-							npc->count1 += 2;
-						}
-						else
-						{
-							if (npc->act_wait < npc->count2 + 60)
-							{
-								++npc->count1;
-							}
-							else
-							{
-								npc->act_wait = 0;
-								npc->act_no = 110;
-								npc->count2 = Random(400, 700);
-								break;
-							}
-						}
-					}
-				}
+				npc->act_wait = 0;
+				npc->act_no = 110;
+				npc->count2 = Random(400, 700);
+				break;
 			}
 
 			if (npc->count1 > 0x3FF)
@@ -387,51 +375,39 @@ void ActBossChar_Twin(void)
 			{
 				--npc->count1;
 			}
+			else if (npc->act_wait < 60)
+			{
+				npc->count1 -= 2;
+			}
+			else if (npc->act_wait < npc->count2)
+			{
+				npc->count1 -= 4;
+			}
+			else if (npc->act_wait < npc->count2 + 40)
+			{
+				npc->count1 -= 2;
+			}
+			else if (npc->act_wait < npc->count2 + 60)
+			{
+				--npc->count1;
+			}
 			else
 			{
-				if (npc->act_wait < 60)
+				if (npc->life < 300)
 				{
-					npc->count1 -= 2;
+					npc->act_wait = 0;
+					npc->act_no = 400;
+					gBoss[2].act_no = 400;
+					gBoss[4].act_no = 400;
 				}
 				else
 				{
-					if (npc->act_wait < npc->count2)
-					{
-						npc->count1 -= 4;
-					}
-					else
-					{
-						if (npc->act_wait < npc->count2 + 40)
-						{
-							npc->count1 -= 2;
-						}
-						else
-						{
-							if (npc->act_wait < npc->count2 + 60)
-							{
-								--npc->count1;
-							}
-							else
-							{
-								if (npc->life < 300)
-								{
-									npc->act_wait = 0;
-									npc->act_no = 400;
-									gBoss[2].act_no = 400;
-									gBoss[4].act_no = 400;
-								}
-								else
-								{
-									npc->act_wait = 0;
-									npc->act_no = 100;
-									npc->count2 = Random(400, 700);
-								}
-
-								break;
-							}
-						}
-					}
+					npc->act_wait = 0;
+					npc->act_no = 100;
+					npc->count2 = Random(400, 700);
 				}
+
+				break;
 			}
 
 			if (npc->count1 <= 0)
@@ -453,41 +429,29 @@ void ActBossChar_Twin(void)
 			{
 				++npc->count1;
 			}
+			else if (npc->act_wait < 120)
+			{
+				npc->count1 += 2;
+			}
+			else if (npc->act_wait < 500)
+			{
+				npc->count1 += 4;
+			}
+			else if (npc->act_wait < 540)
+			{
+				npc->count1 += 2;
+			}
+			else if (npc->act_wait < 560)
+			{
+				++npc->count1;
+			}
 			else
 			{
-				if (npc->act_wait < 120)
-				{
-					npc->count1 += 2;
-				}
-				else
-				{
-					if (npc->act_wait < 500)
-					{
-						npc->count1 += 4;
-					}
-					else
-					{
-						if (npc->act_wait < 540)
-						{
-							npc->count1 += 2;
-						}
-						else
-						{
-							if (npc->act_wait < 560)
-							{
-								++npc->count1;
-							}
-							else
-							{
-								npc->act_no = 100;
-								npc->act_wait = 0;
-								gBoss[2].act_no = 100;
-								gBoss[4].act_no = 100;
-								break;
-							}
-						}
-					}
-				}
+				npc->act_no = 100;
+				npc->act_wait = 0;
+				gBoss[2].act_no = 100;
+				gBoss[4].act_no = 100;
+				break;
 			}
 
 			if (npc->count1 > 0x3FF)
diff --git a/src/BossX.cpp b/src/BossX.cpp
index 5d84b4fc..dfa73365 100644
--- a/src/BossX.cpp
+++ b/src/BossX.cpp
@@ -230,7 +230,6 @@ static void ActBossChar03_02(NPCHAR *npc)
 			npc->act_no = 11;
 			npc->act_wait = 30 * npc->ani_no + 30;
 			// Fallthrough
-
 		case 11:
 			if (npc->act_wait)
 			{
@@ -511,6 +510,7 @@ void ActBossChar_MonstX(void)
 			npc->size = 3;
 			npc->code_event = 1000;
 			npc->ani_no = 0;
+
 			gBoss[1].cond = 0x80;
 			gBoss[1].size = 3;
 			gBoss[1].direct = 0;
@@ -519,8 +519,10 @@ void ActBossChar_MonstX(void)
 			gBoss[1].view.back = 0x3000;
 			gBoss[1].view.bottom = 0x3000;
 			gBoss[1].bits = NPC_IGNORE_SOLIDITY;
+
 			gBoss[2] = gBoss[1];
 			gBoss[2].direct = 2;
+
 			gBoss[3].cond = 0x80;
 			gBoss[3].life = 60;
 			gBoss[3].size = 3;	// Redundant: this get overwritten a few lines later
@@ -537,14 +539,18 @@ void ActBossChar_MonstX(void)
 			gBoss[3].hit.bottom = 0xA00;
 			gBoss[3].bits = NPC_IGNORE_SOLIDITY;
 			gBoss[3].tgt_x = 0;
+
 			gBoss[4] = gBoss[3];
 			gBoss[4].tgt_x = 1;
+
 			gBoss[5] = gBoss[3];
 			gBoss[5].tgt_x = 2;
 			gBoss[5].life = 100;
+
 			gBoss[6] = gBoss[3];
 			gBoss[6].tgt_x = 3;
 			gBoss[6].life = 100;
+
 			gBoss[7].cond = 0x80;
 			gBoss[7].x = 0x100000;
 			gBoss[7].y = 0x19000;
@@ -560,6 +566,7 @@ void ActBossChar_MonstX(void)
 			gBoss[7].bits = NPC_IGNORE_SOLIDITY;
 			gBoss[7].size = 3;
 			gBoss[7].ani_no = 0;
+
 			gBoss[9].cond = 0x80;
 			gBoss[9].act_no = 0;
 			gBoss[9].direct = 1;
@@ -576,8 +583,10 @@ void ActBossChar_MonstX(void)
 			gBoss[9].hit.bottom = 0x2000;
 			gBoss[9].bits = (NPC_SOLID_SOFT | NPC_INVULNERABLE | NPC_IGNORE_SOLIDITY | NPC_REAR_AND_TOP_DONT_HURT);
 			gBoss[9].size = 3;
+
 			gBoss[10] = gBoss[9];
 			gBoss[10].x = 0x108000;
+
 			gBoss[11] = gBoss[9];
 			gBoss[11].direct = 3;
 			gBoss[11].x = 0xF8000;
@@ -586,8 +595,10 @@ void ActBossChar_MonstX(void)
 			gBoss[11].view.bottom = 0x1000;
 			gBoss[11].hit.top = 0x2000;
 			gBoss[11].hit.bottom = 0x1000;
+
 			gBoss[12] = gBoss[11];
 			gBoss[12].x = 0x108000;
+
 			gBoss[13] = gBoss[9];
 			gBoss[13].cond = 0x80;
 			gBoss[13].view.top = 0x2000;
@@ -597,24 +608,28 @@ void ActBossChar_MonstX(void)
 			gBoss[13].count1 = 9;
 			gBoss[13].ani_no = 0;
 			gBoss[13].bits = NPC_IGNORE_SOLIDITY;
+
 			gBoss[14] = gBoss[13];
 			gBoss[14].view.front = 0x5400;
 			gBoss[14].view.back = 0x3C00;
 			gBoss[14].count1 = 10;
 			gBoss[14].ani_no = 1;
 			gBoss[14].bits = NPC_IGNORE_SOLIDITY;
+
 			gBoss[15] = gBoss[13];
 			gBoss[15].view.top = 0x2000;
 			gBoss[15].view.bottom = 0x2000;
 			gBoss[15].count1 = 11;
 			gBoss[15].ani_no = 2;
 			gBoss[15].bits = NPC_IGNORE_SOLIDITY;
+
 			gBoss[16] = gBoss[15];
 			gBoss[16].view.front = 0x5400;
 			gBoss[16].view.back = 0x3C00;
 			gBoss[16].count1 = 12;
 			gBoss[16].ani_no = 3;
 			gBoss[16].bits = NPC_IGNORE_SOLIDITY;
+
 			npc->act_no = 2;
 			break;
 
@@ -836,12 +851,16 @@ void ActBossChar_MonstX(void)
 	ActBossChar03_01(&gBoss[10]);
 	ActBossChar03_01(&gBoss[11]);
 	ActBossChar03_01(&gBoss[12]);
+
 	npc->x += ((gBoss[11].x + gBoss[10].x + gBoss[9].x + gBoss[12].x) / 4 - npc->x) / 16;
+
 	ActBossChar03_face(&gBoss[7]);
+
 	ActBossChar03_02(&gBoss[13]);
 	ActBossChar03_02(&gBoss[14]);
 	ActBossChar03_02(&gBoss[15]);
 	ActBossChar03_02(&gBoss[16]);
+
 	ActBossChar03_03(&gBoss[1]);
 	ActBossChar03_03(&gBoss[2]);