diff --git a/Source/drlg_l1.cpp b/Source/drlg_l1.cpp
index d74409a19..8b70becb7 100644
--- a/Source/drlg_l1.cpp
+++ b/Source/drlg_l1.cpp
@@ -1071,22 +1071,16 @@ static void DRLG_L1Floor()
 	}
 }
 
-static void DRLG_L1Pass3()
+void DRLG_LPass3(int lv)
 {
-	int i, j, xx, yy;
-	long v1, v2, v3, v4, lv;
-	WORD *MegaTiles;
-
-	lv = 22 - 1;
-
-	MegaTiles = (WORD *)&pMegaTiles[lv * 8];
-	v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
-	v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
-	v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
-	v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
-
-	for (j = 0; j < MAXDUNY; j += 2) {
-		for (i = 0; i < MAXDUNX; i += 2) {
+	WORD *MegaTiles = (WORD *)&pMegaTiles[lv * 8];
+	int v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
+	int v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
+	int v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
+	int v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
+
+	for (int j = 0; j < MAXDUNY; j += 2) {
+		for (int i = 0; i < MAXDUNX; i += 2) {
 			dPiece[i][j] = v1;
 			dPiece[i + 1][j] = v2;
 			dPiece[i][j + 1] = v3;
@@ -1094,17 +1088,23 @@ static void DRLG_L1Pass3()
 		}
 	}
 
-	yy = 16;
-	for (j = 0; j < DMAXY; j++) {
-		xx = 16;
-		for (i = 0; i < DMAXX; i++) {
+	int yy = 16;
+	for (int j = 0; j < DMAXY; j++) {
+		int xx = 16;
+		for (int i = 0; i < DMAXX; i++) {
 			lv = dungeon[i][j] - 1;
-			assert(lv >= 0);
-			MegaTiles = (WORD *)&pMegaTiles[lv * 8];
-			v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
-			v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
-			v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
-			v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
+			if (lv >= 0) {
+				MegaTiles = (WORD *)&pMegaTiles[lv * 8];
+				v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
+				v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
+				v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
+				v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
+			} else {
+				v1 = 0;
+				v2 = 0;
+				v3 = 0;
+				v4 = 0;
+			}
 			dPiece[xx][yy] = v1;
 			dPiece[xx + 1][yy] = v2;
 			dPiece[xx][yy + 1] = v3;
@@ -1115,6 +1115,11 @@ static void DRLG_L1Pass3()
 	}
 }
 
+static void DRLG_L1Pass3()
+{
+	DRLG_LPass3(22 - 1);
+}
+
 static void DRLG_LoadL1SP()
 {
 	L5setloadflag = false;
diff --git a/Source/drlg_l1.h b/Source/drlg_l1.h
index 54fb557ae..65d05dd89 100644
--- a/Source/drlg_l1.h
+++ b/Source/drlg_l1.h
@@ -20,6 +20,7 @@ extern int UberLeverCol;
 extern bool IsUberLeverActivated;
 extern int UberDiabloMonsterIndex;
 
+void DRLG_LPass3(int lv);
 void DRLG_Init_Globals();
 void LoadL1Dungeon(const char *sFileName, int vx, int vy);
 void LoadPreL1Dungeon(const char *sFileName);
diff --git a/Source/drlg_l2.cpp b/Source/drlg_l2.cpp
index 22322b285..b811e0ed7 100644
--- a/Source/drlg_l2.cpp
+++ b/Source/drlg_l2.cpp
@@ -2844,45 +2844,7 @@ static bool CreateDungeon()
 
 static void DRLG_L2Pass3()
 {
-	int i, j, xx, yy;
-	long v1, v2, v3, v4, lv;
-	WORD *MegaTiles;
-
-	lv = 12 - 1;
-
-	MegaTiles = (WORD *)&pMegaTiles[lv * 8];
-	v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
-	v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
-	v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
-	v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
-
-	for (j = 0; j < MAXDUNY; j += 2) {
-		for (i = 0; i < MAXDUNX; i += 2) {
-			dPiece[i][j] = v1;
-			dPiece[i + 1][j] = v2;
-			dPiece[i][j + 1] = v3;
-			dPiece[i + 1][j + 1] = v4;
-		}
-	}
-
-	yy = 16;
-	for (j = 0; j < DMAXY; j++) {
-		xx = 16;
-		for (i = 0; i < DMAXX; i++) {
-			lv = dungeon[i][j] - 1;
-			MegaTiles = (WORD *)&pMegaTiles[lv * 8];
-			v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
-			v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
-			v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
-			v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
-			dPiece[xx][yy] = v1;
-			dPiece[xx + 1][yy] = v2;
-			dPiece[xx][yy + 1] = v3;
-			dPiece[xx + 1][yy + 1] = v4;
-			xx += 2;
-		}
-		yy += 2;
-	}
+	DRLG_LPass3(12 - 1);
 }
 
 static void DRLG_L2FTVR(int i, int j, int x, int y, int d)
diff --git a/Source/drlg_l3.cpp b/Source/drlg_l3.cpp
index a4aae95d5..9d6b43f53 100644
--- a/Source/drlg_l3.cpp
+++ b/Source/drlg_l3.cpp
@@ -2575,52 +2575,7 @@ static void DRLG_L3(lvl_entry entry)
 
 static void DRLG_L3Pass3()
 {
-	int i, j, xx, yy;
-	long v1, v2, v3, v4, lv;
-	WORD *MegaTiles;
-
-	lv = 8 - 1;
-
-	MegaTiles = (WORD *)&pMegaTiles[lv * 8];
-	v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
-	v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
-	v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
-	v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
-
-	for (j = 0; j < MAXDUNY; j += 2) {
-		for (i = 0; i < MAXDUNX; i += 2) {
-			dPiece[i][j] = v1;
-			dPiece[i + 1][j] = v2;
-			dPiece[i][j + 1] = v3;
-			dPiece[i + 1][j + 1] = v4;
-		}
-	}
-
-	yy = 16;
-	for (j = 0; j < DMAXY; j++) {
-		xx = 16;
-		for (i = 0; i < DMAXX; i++) {
-			lv = dungeon[i][j] - 1;
-			if (lv >= 0) {
-				MegaTiles = (WORD *)&pMegaTiles[lv * 8];
-				v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
-				v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
-				v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
-				v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
-			} else {
-				v1 = 0;
-				v2 = 0;
-				v3 = 0;
-				v4 = 0;
-			}
-			dPiece[xx][yy] = v1;
-			dPiece[xx + 1][yy] = v2;
-			dPiece[xx][yy + 1] = v3;
-			dPiece[xx + 1][yy + 1] = v4;
-			xx += 2;
-		}
-		yy += 2;
-	}
+	DRLG_LPass3(8 - 1);
 }
 
 void CreateL3Dungeon(DWORD rseed, lvl_entry entry)
diff --git a/Source/drlg_l4.cpp b/Source/drlg_l4.cpp
index 819f699d7..e7d2ca60c 100644
--- a/Source/drlg_l4.cpp
+++ b/Source/drlg_l4.cpp
@@ -1749,52 +1749,7 @@ static void DRLG_L4(lvl_entry entry)
 
 static void DRLG_L4Pass3()
 {
-	int i, j, xx, yy;
-	long v1, v2, v3, v4, lv;
-	WORD *MegaTiles;
-
-	lv = 30 - 1;
-
-	MegaTiles = (WORD *)&pMegaTiles[lv * 8];
-	v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
-	v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
-	v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
-	v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
-
-	for (j = 0; j < MAXDUNY; j += 2) {
-		for (i = 0; i < MAXDUNX; i += 2) {
-			dPiece[i][j] = v1;
-			dPiece[i + 1][j] = v2;
-			dPiece[i][j + 1] = v3;
-			dPiece[i + 1][j + 1] = v4;
-		}
-	}
-
-	yy = 16;
-	for (j = 0; j < DMAXY; j++) {
-		xx = 16;
-		for (i = 0; i < DMAXX; i++) {
-			lv = dungeon[i][j] - 1;
-			if (lv >= 0) {
-				MegaTiles = (WORD *)&pMegaTiles[lv * 8];
-				v1 = SDL_SwapLE16(*(MegaTiles + 0)) + 1;
-				v2 = SDL_SwapLE16(*(MegaTiles + 1)) + 1;
-				v3 = SDL_SwapLE16(*(MegaTiles + 2)) + 1;
-				v4 = SDL_SwapLE16(*(MegaTiles + 3)) + 1;
-			} else {
-				v1 = 0;
-				v2 = 0;
-				v3 = 0;
-				v4 = 0;
-			}
-			dPiece[xx][yy] = v1;
-			dPiece[xx + 1][yy] = v2;
-			dPiece[xx][yy + 1] = v3;
-			dPiece[xx + 1][yy + 1] = v4;
-			xx += 2;
-		}
-		yy += 2;
-	}
+	DRLG_LPass3(30 - 1);
 }
 
 void CreateL4Dungeon(DWORD rseed, lvl_entry entry)