diff --git a/Source/drlg_l1.cpp b/Source/drlg_l1.cpp
index 7b437d696..63bb25c5f 100644
--- a/Source/drlg_l1.cpp
+++ b/Source/drlg_l1.cpp
@@ -615,11 +615,11 @@ void __fastcall DRLG_L5(int entry)
 		{
 			if ( v13 )
 			{
-				if ( DRLG_PlaceMiniSet((unsigned char *)PWATERIN, 1, 1, 0, 0, 0, -1, 0) < 0 )
+				if ( DRLG_PlaceMiniSet(PWATERIN, 1, 1, 0, 0, 0, -1, 0) < 0 )
 					v2 = 0;
 				--ViewY;
 			}
-			else if ( DRLG_PlaceMiniSet((unsigned char *)PWATERIN, 1, 1, 0, 0, 1, -1, 0) < 0 )
+			else if ( DRLG_PlaceMiniSet(PWATERIN, 1, 1, 0, 0, 1, -1, 0) < 0 )
 			{
 				v2 = 0;
 			}
@@ -628,10 +628,10 @@ void __fastcall DRLG_L5(int entry)
 		{
 			if ( !v13 )
 			{
-				v5 = DRLG_PlaceMiniSet((unsigned char *)STAIRSUP, 1, 1, 0, 0, 1, -1, 0);
+				v5 = DRLG_PlaceMiniSet(STAIRSUP, 1, 1, 0, 0, 1, -1, 0);
 				goto LABEL_21;
 			}
-			if ( DRLG_PlaceMiniSet((unsigned char *)STAIRSUP, 1, 1, 0, 0, 0, -1, 0) < 0 )
+			if ( DRLG_PlaceMiniSet(STAIRSUP, 1, 1, 0, 0, 0, -1, 0) < 0 )
 				v2 = 0;
 			if ( v13 == 1 )
 			{
@@ -645,16 +645,16 @@ LABEL_33:
 		}
 		if ( v13 )
 		{
-			if ( DRLG_PlaceMiniSet((unsigned char *)L5STAIRSUP, 1, 1, 0, 0, 0, -1, 0) < 0
-			  || DRLG_PlaceMiniSet((unsigned char *)STAIRSDOWN, 1, 1, 0, 0, 1, -1, 1) < 0 )
+			if ( DRLG_PlaceMiniSet(L5STAIRSUP, 1, 1, 0, 0, 0, -1, 0) < 0
+			  || DRLG_PlaceMiniSet(STAIRSDOWN, 1, 1, 0, 0, 1, -1, 1) < 0 )
 			{
 				v2 = 0;
 			}
 			goto LABEL_33;
 		}
-		if ( DRLG_PlaceMiniSet((unsigned char *)L5STAIRSUP, 1, 1, 0, 0, 1, -1, 0) >= 0 )
+		if ( DRLG_PlaceMiniSet(L5STAIRSUP, 1, 1, 0, 0, 1, -1, 0) >= 0 )
 		{
-			v5 = DRLG_PlaceMiniSet((unsigned char *)STAIRSDOWN, 1, 1, 0, 0, 0, -1, 1);
+			v5 = DRLG_PlaceMiniSet(STAIRSDOWN, 1, 1, 0, 0, 0, -1, 1);
 LABEL_21:
 			if ( v5 < 0 )
 				v2 = 0;
@@ -705,7 +705,7 @@ LABEL_34:
 	while ( v8 < 40 );
 	DRLG_L5Subs();
 	DRLG_L1Shadows();
-	DRLG_PlaceMiniSet((unsigned char *)LAMPS, 5, 10, 0, 0, 0, -1, 4);
+	DRLG_PlaceMiniSet(LAMPS, 5, 10, 0, 0, 0, -1, 4);
 	DRLG_L1Floor();
 	do
 	{
@@ -961,222 +961,215 @@ void __cdecl DRLG_L1Shadows()
 	while ( v10 < 40 );
 }
 
-int __fastcall DRLG_PlaceMiniSet(unsigned char *miniset, int tmin, int tmax, int cx, int cy, bool setview, int noquad, int ldir)
+int __fastcall DRLG_PlaceMiniSet(const unsigned char *miniset, int tmin, int tmax, int cx, int cy, bool setview, int noquad, int ldir)
 {
 	unsigned char *v8; // ebx
 	int v9; // edi
 	int v10; // esi
 	int v11; // edx
-	int v12; // eax
-	int v14; // esi
-	int v15; // edi
-	int v16; // ebx
-	signed int v17; // edx
-	int v18; // eax
-	unsigned char v19; // cl
-	int v20; // ebx
+	int v12; // esi
+	int v13; // edi
+	int v14; // ebx
+	signed int v15; // edx
+	int v16; // eax
+	unsigned char v17; // cl
+	int v18; // ebx
 	int result; // eax
-	int v22; // eax
-	unsigned char v23; // dl
-	unsigned char v24; // bl
-	bool v25; // zf
-	bool v26; // sf
-	unsigned char v27; // of
-	int v28; // [esp-4h] [ebp-34h]
-	int v29; // [esp+Ch] [ebp-24h]
-	unsigned char *v30; // [esp+10h] [ebp-20h]
-	int v31; // [esp+14h] [ebp-1Ch]
-	int v32; // [esp+18h] [ebp-18h]
-	int v33; // [esp+1Ch] [ebp-14h]
-	signed int v34; // [esp+20h] [ebp-10h]
+	int v20; // eax
+	char *v21; // ecx
+	char v22; // dl
+	char v23; // bl
+	bool v24; // zf
+	bool v25; // sf
+	unsigned char v26; // of
+	int v27; // [esp-4h] [ebp-34h]
+	int v28; // [esp+Ch] [ebp-24h]
+	const unsigned char *v29; // [esp+10h] [ebp-20h]
+	int v30; // [esp+14h] [ebp-1Ch]
+	int v31; // [esp+18h] [ebp-18h]
+	int v32; // [esp+1Ch] [ebp-14h]
+	int v33; // [esp+20h] [ebp-10h]
 	int max; // [esp+24h] [ebp-Ch]
-	int v36; // [esp+28h] [ebp-8h]
-	int v37; // [esp+2Ch] [ebp-4h]
+	int v35; // [esp+28h] [ebp-8h]
+	int v36; // [esp+2Ch] [ebp-4h]
 	int tmaxa; // [esp+38h] [ebp+8h]
 	int tmaxb; // [esp+38h] [ebp+8h]
 
-	v8 = miniset;
+	v8 = (unsigned char *)miniset;
 	v9 = *miniset;
 	v10 = tmin;
 	v11 = tmax - tmin;
-	v30 = miniset;
-	v36 = *miniset;
-	v37 = miniset[1];
+	v29 = miniset;
+	v35 = *miniset;
+	v36 = miniset[1];
 	if ( v11 )
-	{
-		v31 = v10 + random(0, v11);
-	}
+		v30 = v10 + random(0, v11);
 	else
-	{
-		v31 = 1;
-	}
-	v32 = 0;
-	if ( v31 > 0 )
+		v30 = 1;
+	v31 = 0;
+	if ( v30 > 0 )
 	{
 		max = 40 - v9;
-		v29 = 40 - v37;
+		v28 = 40 - v36;
 		while ( 1 )
 		{
 			v12 = random(0, max);
-			v14 = v12;
-			v33 = 0;
-			v15 = random(0, v29);
+			v32 = 0;
+			v13 = random(0, v28);
 			while ( 1 )
 			{
 				tmaxa = 1;
-				if ( cx != -1 && v14 >= cx - v36 && v14 <= cx + 12 )
+				if ( cx != -1 && v12 >= cx - v35 && v12 <= cx + 12 )
 				{
-					++v14;
+					++v12;
 					tmaxa = 0;
 				}
-				miniset = (unsigned char *)cy;
-				if ( cy != -1 && v15 >= cy - v37 && v15 <= cy + 12 )
+				if ( cy != -1 && v13 >= cy - v36 && v13 <= cy + 12 )
 				{
-					++v15;
+					++v13;
 					tmaxa = 0;
 				}
-				v16 = 0;
+				v14 = 0;
 				switch ( noquad )
 				{
 					case 0:
-						if ( v14 >= cx )
+						if ( v12 >= cx )
 							goto LABEL_29;
 						goto LABEL_27;
 					case 1:
-						if ( v14 <= cx )
+						if ( v12 <= cx )
 							goto LABEL_29;
 LABEL_27:
-						if ( v15 >= cy )
+						if ( v13 >= cy )
 							goto LABEL_29;
 LABEL_28:
 						tmaxa = 0;
 						goto LABEL_29;
 					case 2:
-						if ( v14 >= cx )
+						if ( v12 >= cx )
 							goto LABEL_29;
 LABEL_22:
-						if ( v15 <= cy )
+						if ( v13 <= cy )
 							goto LABEL_29;
 						goto LABEL_28;
 				}
-				if ( noquad == 3 && v14 > cx )
+				if ( noquad == 3 && v12 > cx )
 					goto LABEL_22;
 LABEL_29:
-				v17 = 2;
-				if ( v37 > 0 )
+				v15 = 2;
+				if ( v36 > 0 )
 				{
 					do
 					{
 						if ( tmaxa != 1 )
 							break;
-						v34 = 0;
-						if ( v36 > 0 )
+						v33 = 0;
+						if ( v35 > 0 )
 						{
-							v18 = v15 + v16 + 40 * v14;
+							v16 = v13 + v14 + 40 * v12;
 							do
 							{
 								if ( tmaxa != 1 )
 									break;
-								v19 = v30[v17];
-								if ( v19 && dungeon[0][v18] != v19 )
+								v17 = v29[v15];
+								if ( v17 && dungeon[0][v16] != v17 )
 									tmaxa = 0;
-								if ( mydflags[0][v18] )
+								if ( mydflags[0][v16] )
 									tmaxa = 0;
-								miniset = (unsigned char *)v36;
-								++v17;
-								++v34;
-								v18 += 40;
+								++v15;
+								++v33;
+								v16 += 40;
 							}
-							while ( v34 < v36 );
+							while ( v33 < v35 );
 						}
-						++v16;
+						++v14;
 					}
-					while ( v16 < v37 );
+					while ( v14 < v36 );
 				}
-				v20 = 0;
+				v18 = 0;
 				if ( tmaxa )
 					break;
-				if ( ++v14 == max )
+				if ( ++v12 == max )
 				{
-					v14 = 0;
-					if ( ++v15 == v29 )
-						v15 = 0;
+					v12 = 0;
+					if ( ++v13 == v28 )
+						v13 = 0;
 				}
-				if ( ++v33 > 4000 )
+				if ( ++v32 > 4000 )
 					return -1;
 			}
-			v22 = v36 * v37 + 2;
-			if ( v37 > 0 )
+			v20 = v35 * v36 + 2;
+			if ( v36 > 0 )
 			{
 				do
 				{
-					if ( v36 > 0 )
+					if ( v35 > 0 )
 					{
-						tmaxb = v36;
-						miniset = (unsigned char *)&dungeon[v14][v20 + v15];
+						tmaxb = v35;
+						v21 = &dungeon[v12][v18 + v13];
 						do
 						{
-							v23 = v30[v22];
-							if ( v23 )
-								*miniset = v23;
-							++v22;
-							miniset += 40;
+							v22 = v29[v20];
+							if ( v22 )
+								*v21 = v22;
+							++v20;
+							v21 += 40;
 							--tmaxb;
 						}
 						while ( tmaxb );
 					}
-					++v20;
+					++v18;
 				}
-				while ( v20 < v37 );
+				while ( v18 < v36 );
 			}
-			if ( ++v32 >= v31 )
+			if ( ++v31 >= v30 )
 			{
-				v8 = (unsigned char *)v30;
+				v8 = (unsigned char *)v29;
 				goto LABEL_57;
 			}
 		}
 	}
-	v14 = cx;
-	v15 = cx;
+	v12 = cx;
+	v13 = cx;
 LABEL_57:
 	if ( v8 == PWATERIN )
 	{
-		v24 = TransVal;
+		v23 = TransVal;
 		TransVal = 0;
-		DRLG_MRectTrans(v14, v15 + 2, v14 + 5, v15 + 4);
-		TransVal = v24;
-		quests[13]._qtx = 2 * v14 + 21;
-		quests[13]._qty = 2 * v15 + 22;
+		DRLG_MRectTrans(v12, v13 + 2, v12 + 5, v13 + 4);
+		TransVal = v23;
+		quests[13]._qtx = 2 * v12 + 21;
+		quests[13]._qty = 2 * v13 + 22;
 	}
 	result = 1;
 	if ( setview == 1 )
 	{
-		ViewX = 2 * v14 + 19;
-		ViewY = 2 * v15 + 20;
+		ViewX = 2 * v12 + 19;
+		ViewY = 2 * v13 + 20;
 	}
 	if ( !ldir )
 	{
-		LvlViewX = 2 * v14 + 19;
-		LvlViewY = 2 * v15 + 20;
+		LvlViewX = 2 * v12 + 19;
+		LvlViewY = 2 * v13 + 20;
 	}
-	v27 = __OFSUB__(v14, cx);
-	v25 = v14 == cx;
-	v26 = v14 - cx < 0;
-	if ( v14 < cx )
+	v26 = __OFSUB__(v12, cx);
+	v24 = v12 == cx;
+	v25 = v12 - cx < 0;
+	if ( v12 < cx )
 	{
-		if ( v15 < cy )
+		if ( v13 < cy )
 			return 0;
-		v27 = __OFSUB__(v14, cx);
-		v25 = v14 == cx;
-		v26 = v14 - cx < 0;
+		v26 = __OFSUB__(v12, cx);
+		v24 = v12 == cx;
+		v25 = v12 - cx < 0;
 	}
-	if ( (unsigned char)(v26 ^ v27) | v25 || v15 >= cy )
+	if ( (unsigned char)(v25 ^ v26) | v24 || v13 >= cy )
 	{
-		if ( v14 >= cx || v15 <= cy )
-			v28 = 3;
+		if ( v12 >= cx || v13 <= cy )
+			v27 = 3;
 		else
-			v28 = 2;
-		result = v28;
+			v27 = 2;
+		result = v27;
 	}
 	return result;
 }
diff --git a/Source/drlg_l1.h b/Source/drlg_l1.h
index 31c1fb8be..7e364d54a 100644
--- a/Source/drlg_l1.h
+++ b/Source/drlg_l1.h
@@ -25,7 +25,7 @@ void __cdecl DRLG_FreeL1SP();
 void __fastcall DRLG_L5(int entry);
 void __fastcall DRLG_PlaceDoor(int x, int y);
 void __cdecl DRLG_L1Shadows();
-int __fastcall DRLG_PlaceMiniSet(unsigned char *miniset, int tmin, int tmax, int cx, int cy, bool setview, int noquad, int ldir);
+int __fastcall DRLG_PlaceMiniSet(const unsigned char *miniset, int tmin, int tmax, int cx, int cy, bool setview, int noquad, int ldir);
 void __cdecl InitL5Dungeon();
 void __cdecl L5ClearFlags();
 void __cdecl L5firstRoom();
diff --git a/Source/drlg_l3.cpp b/Source/drlg_l3.cpp
index a9cbea6df..6abec8832 100644
--- a/Source/drlg_l3.cpp
+++ b/Source/drlg_l3.cpp
@@ -542,23 +542,23 @@ void __fastcall DRLG_L3(int entry)
 			DRLG_L3MakeMegas();
 			if ( !entry )
 			{
-				genok = DRLG_L3PlaceMiniSet((unsigned char *)L3UP, 1, 1, -1, -1, 1, 0);
+				genok = DRLG_L3PlaceMiniSet(L3UP, 1, 1, -1, -1, 1, 0);
 				if ( genok )
 					continue;
-				genok = DRLG_L3PlaceMiniSet((unsigned char *)L3DOWN, 1, 1, -1, -1, 0, 1);
+				genok = DRLG_L3PlaceMiniSet(L3DOWN, 1, 1, -1, -1, 0, 1);
 				if ( genok )
 					continue;
 				if ( currlevel != 9 )
 					goto LABEL_24;
-				genok = DRLG_L3PlaceMiniSet((unsigned char *)L3HOLDWARP, 1, 1, -1, -1, 0, 6);
+				genok = DRLG_L3PlaceMiniSet(L3HOLDWARP, 1, 1, -1, -1, 0, 6);
 				goto LABEL_23;
 			}
-			genok = DRLG_L3PlaceMiniSet((unsigned char *)L3UP, 1, 1, -1, -1, 0, 0);
+			genok = DRLG_L3PlaceMiniSet(L3UP, 1, 1, -1, -1, 0, 0);
 			if ( entry == 1 )
 			{
 				if ( genok )
 					continue;
-				genok = DRLG_L3PlaceMiniSet((unsigned char *)L3DOWN, 1, 1, -1, -1, 1, 1);
+				genok = DRLG_L3PlaceMiniSet(L3DOWN, 1, 1, -1, -1, 1, 1);
 				ViewX += 2;
 				ViewY -= 2;
 				if ( genok )
@@ -567,7 +567,7 @@ void __fastcall DRLG_L3(int entry)
 					goto LABEL_24;
 				v24 = 0;
 LABEL_22:
-				genok = DRLG_L3PlaceMiniSet((unsigned char *)L3HOLDWARP, 1, 1, -1, -1, v24, 6);
+				genok = DRLG_L3PlaceMiniSet(L3HOLDWARP, 1, 1, -1, -1, v24, 6);
 LABEL_23:
 				if ( genok )
 					continue;
@@ -575,7 +575,7 @@ LABEL_23:
 			}
 			if ( genok )
 				continue;
-			genok = DRLG_L3PlaceMiniSet((unsigned char *)L3DOWN, 1, 1, -1, -1, 0, 1);
+			genok = DRLG_L3PlaceMiniSet(L3DOWN, 1, 1, -1, -1, 0, 1);
 			if ( genok )
 				continue;
 			if ( currlevel == 9 )
@@ -594,13 +594,13 @@ LABEL_24:
 	while ( !lavapool );
 	DRLG_L3PoolFix();
 	FixL3Warp();
-	DRLG_L3PlaceRndSet((unsigned char *)L3ISLE1, 70);
-	DRLG_L3PlaceRndSet((unsigned char *)L3ISLE2, 70);
-	DRLG_L3PlaceRndSet((unsigned char *)L3ISLE3, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3ISLE4, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3ISLE1, 100);
-	DRLG_L3PlaceRndSet((unsigned char *)L3ISLE2, 100);
-	DRLG_L3PlaceRndSet((unsigned char *)L3ISLE5, 90);
+	DRLG_L3PlaceRndSet(L3ISLE1, 70);
+	DRLG_L3PlaceRndSet(L3ISLE2, 70);
+	DRLG_L3PlaceRndSet(L3ISLE3, 30);
+	DRLG_L3PlaceRndSet(L3ISLE4, 30);
+	DRLG_L3PlaceRndSet(L3ISLE1, 100);
+	DRLG_L3PlaceRndSet(L3ISLE2, 100);
+	DRLG_L3PlaceRndSet(L3ISLE5, 90);
 	FixL3HallofHeroes();
 	DRLG_L3River();
 
@@ -616,33 +616,33 @@ LABEL_24:
 
 	DRLG_PlaceThemeRooms(5, 10, 7, 0, 0);
 	DRLG_L3Wood();
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE1, 10);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE2, 10);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE3, 10);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE6, 20);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE7, 20);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE8, 20);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE9, 20);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE10, 20);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE11, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE12, 20);
-	DRLG_L3PlaceRndSet((unsigned char *)L3TITE13, 20);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV1, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV2, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV3, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV4, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV5, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV6, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV7, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV8, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV9, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV10, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3CREV11, 30);
-	DRLG_L3PlaceRndSet((unsigned char *)L3XTRA1, 25);
-	DRLG_L3PlaceRndSet((unsigned char *)L3XTRA2, 25);
-	DRLG_L3PlaceRndSet((unsigned char *)L3XTRA3, 25);
-	DRLG_L3PlaceRndSet((unsigned char *)L3XTRA4, 25);
-	DRLG_L3PlaceRndSet((unsigned char *)L3XTRA5, 25);
+	DRLG_L3PlaceRndSet(L3TITE1, 10);
+	DRLG_L3PlaceRndSet(L3TITE2, 10);
+	DRLG_L3PlaceRndSet(L3TITE3, 10);
+	DRLG_L3PlaceRndSet(L3TITE6, 20);
+	DRLG_L3PlaceRndSet(L3TITE7, 20);
+	DRLG_L3PlaceRndSet(L3TITE8, 20);
+	DRLG_L3PlaceRndSet(L3TITE9, 20);
+	DRLG_L3PlaceRndSet(L3TITE10, 20);
+	DRLG_L3PlaceRndSet(L3TITE11, 30);
+	DRLG_L3PlaceRndSet(L3TITE12, 20);
+	DRLG_L3PlaceRndSet(L3TITE13, 20);
+	DRLG_L3PlaceRndSet(L3CREV1, 30);
+	DRLG_L3PlaceRndSet(L3CREV2, 30);
+	DRLG_L3PlaceRndSet(L3CREV3, 30);
+	DRLG_L3PlaceRndSet(L3CREV4, 30);
+	DRLG_L3PlaceRndSet(L3CREV5, 30);
+	DRLG_L3PlaceRndSet(L3CREV6, 30);
+	DRLG_L3PlaceRndSet(L3CREV7, 30);
+	DRLG_L3PlaceRndSet(L3CREV8, 30);
+	DRLG_L3PlaceRndSet(L3CREV9, 30);
+	DRLG_L3PlaceRndSet(L3CREV10, 30);
+	DRLG_L3PlaceRndSet(L3CREV11, 30);
+	DRLG_L3PlaceRndSet(L3XTRA1, 25);
+	DRLG_L3PlaceRndSet(L3XTRA2, 25);
+	DRLG_L3PlaceRndSet(L3XTRA3, 25);
+	DRLG_L3PlaceRndSet(L3XTRA4, 25);
+	DRLG_L3PlaceRndSet(L3XTRA5, 25);
 
 	for(i = 0; i < 40; i++)
 	{
@@ -1976,163 +1976,149 @@ void __cdecl DRLG_L3PoolFix()
 	while ( v0 < 40 );
 }
 
-int __fastcall DRLG_L3PlaceMiniSet(unsigned char *miniset, int tmin, int tmax, int cx, int cy, bool setview, int ldir)
+int __fastcall DRLG_L3PlaceMiniSet(const unsigned char *miniset, int tmin, int tmax, int cx, int cy, bool setview, int ldir)
 {
 	int v7; // ebx
 	int v8; // esi
 	int v9; // edi
 	int v10; // edx
-	int v11; // eax
-	int v13; // esi
-	signed int v14; // ebx
-	int v15; // ecx
-	int v16; // eax
-	int v18; // eax
-	int v20; // edi
+	int v11; // esi
+	signed int v12; // ebx
+	int v13; // edi
 	signed int i; // eax
-	int v22; // ecx
-	unsigned char v23; // dl
-	int v24; // eax
-	int v25; // edi
-	char *v26; // edx
-	unsigned char v27; // bl
-	unsigned char *v29; // [esp+Ch] [ebp-24h]
-	int v30; // [esp+10h] [ebp-20h]
-	int v31; // [esp+14h] [ebp-1Ch]
-	int v32; // [esp+18h] [ebp-18h]
-	signed int v33; // [esp+1Ch] [ebp-14h]
-	int v34; // [esp+20h] [ebp-10h]
-	int v35; // [esp+24h] [ebp-Ch]
-	int v36; // [esp+28h] [ebp-8h]
+	int v15; // ecx
+	unsigned char v16; // dl
+	int v17; // eax
+	int v18; // ecx
+	int v19; // edi
+	char *v20; // edx
+	char v21; // bl
+	const unsigned char *v23; // [esp+Ch] [ebp-24h]
+	int v24; // [esp+10h] [ebp-20h]
+	int v25; // [esp+14h] [ebp-1Ch]
+	int v26; // [esp+18h] [ebp-18h]
+	signed int v27; // [esp+1Ch] [ebp-14h]
+	int v28; // [esp+20h] [ebp-10h]
+	int v29; // [esp+24h] [ebp-Ch]
+	int v30; // [esp+28h] [ebp-8h]
 	int max; // [esp+2Ch] [ebp-4h]
 
 	v7 = miniset[1];
 	v8 = tmin;
 	v9 = *miniset;
-	v29 = miniset;
+	v23 = miniset;
 	v10 = tmax - tmin;
-	v34 = *miniset;
-	v35 = miniset[1];
+	v28 = *miniset;
+	v29 = miniset[1];
 	if ( v10 )
-	{
-		v30 = v8 + random(0, v10);
-	}
+		v24 = v8 + random(0, v10);
 	else
+		v24 = 1;
+	v25 = 0;
+	if ( v24 <= 0 )
 	{
-		v30 = 1;
-	}
-	v31 = 0;
-	if ( v30 <= 0 )
-	{
-		v13 = tmax;
+		v11 = tmax;
 	}
 	else
 	{
 		max = 40 - v9;
-		v36 = 40 - v7;
+		v30 = 40 - v7;
 		do
 		{
 			v11 = random(0, max);
-			v13 = v11;
-			v33 = 0;
-			tmax = random(0, v36);
+			v27 = 0;
+			tmax = random(0, v30);
 			while ( 1 )
 			{
-				if ( v33 >= 200 )
+				if ( v27 >= 200 )
 					return 1;
-				++v33;
-				v14 = 1;
-				if ( cx != -1 )
+				++v27;
+				v12 = 1;
+				if ( cx != -1 && v11 >= cx - v28 && v11 <= cx + 12 )
 				{
-					v15 = cx - v34;
-					if ( v13 >= cx - v34 && v13 <= cx + 12 )
-					{
-						v16 = random(0, max);
-						v13 = v16;
-						tmax = random(0, v36);
-						v14 = 0;
-					}
+					v11 = random(0, max);
+					tmax = random(0, v30);
+					v12 = 0;
 				}
-				if ( cy != -1 && tmax >= cy - v35 && tmax <= cy + 12 )
+				if ( cy != -1 && tmax >= cy - v29 && tmax <= cy + 12 )
 				{
-					v18 = random(0, max); /* cy - v35 */
-					v13 = v18;
-					tmax = random(0, v36);
-					v14 = 0;
+					v11 = random(0, max);
+					tmax = random(0, v30);
+					v12 = 0;
 				}
-				v20 = 0;
-				for ( i = 2; v20 < v35; ++v20 )
+				v13 = 0;
+				for ( i = 2; v13 < v29; ++v13 )
 				{
-					if ( v14 != 1 )
+					if ( v12 != 1 )
 						break;
-					v32 = 0;
-					if ( v34 > 0 )
+					v26 = 0;
+					if ( v28 > 0 )
 					{
-						v22 = tmax + v20 + 40 * v13;
+						v15 = tmax + v13 + 40 * v11;
 						do
 						{
-							if ( v14 != 1 )
+							if ( v12 != 1 )
 								break;
-							v23 = v29[i];
-							if ( v23 && dungeon[0][v22] != v23 )
-								v14 = 0;
-							if ( dflags[0][v22] )
-								v14 = 0;
+							v16 = v23[i];
+							if ( v16 && dungeon[0][v15] != v16 )
+								v12 = 0;
+							if ( dflags[0][v15] )
+								v12 = 0;
 							++i;
-							++v32;
-							v22 += 40;
+							++v26;
+							v15 += 40;
 						}
-						while ( v32 < v34 );
+						while ( v26 < v28 );
 					}
 				}
-				v24 = 0;
-				if ( v14 )
+				v17 = 0;
+				if ( v12 )
 					break;
-				if ( ++v13 == max )
+				if ( ++v11 == max )
 				{
-					v13 = 0;
-					if ( ++tmax == v36 )
+					v11 = 0;
+					if ( ++tmax == v30 )
 						tmax = 0;
 				}
 			}
-			if ( v33 >= 200 )
+			if ( v27 >= 200 )
 				return 1;
-			miniset = (unsigned char *)(v34 * v35 + 2);
-			if ( v35 > 0 )
+			v18 = v28 * v29 + 2;
+			if ( v29 > 0 )
 			{
 				do
 				{
-					v25 = v34;
-					if ( v34 > 0 )
+					v19 = v28;
+					if ( v28 > 0 )
 					{
-						v26 = &dungeon[v13][v24 + tmax];
+						v20 = &dungeon[v11][v17 + tmax];
 						do
 						{
-							v27 = v29[(_DWORD)miniset];
-							if ( v27 )
-								*v26 = v27;
-							++miniset;
-							v26 += 40;
-							--v25;
+							v21 = v23[v18];
+							if ( v21 )
+								*v20 = v21;
+							++v18;
+							v20 += 40;
+							--v19;
 						}
-						while ( v25 );
+						while ( v19 );
 					}
-					++v24;
+					++v17;
 				}
-				while ( v24 < v35 );
+				while ( v17 < v29 );
 			}
-			++v31;
+			++v25;
 		}
-		while ( v31 < v30 );
+		while ( v25 < v24 );
 	}
 	if ( setview == 1 )
 	{
-		ViewX = 2 * v13 + 17;
+		ViewX = 2 * v11 + 17;
 		ViewY = 2 * tmax + 19;
 	}
 	if ( !ldir )
 	{
-		LvlViewX = 2 * v13 + 17;
+		LvlViewX = 2 * v11 + 17;
 		LvlViewY = 2 * tmax + 19;
 	}
 	return 0;
@@ -2140,9 +2126,9 @@ int __fastcall DRLG_L3PlaceMiniSet(unsigned char *miniset, int tmin, int tmax, i
 // 5CF320: using guessed type int LvlViewY;
 // 5CF324: using guessed type int LvlViewX;
 
-void __fastcall DRLG_L3PlaceRndSet(unsigned char *miniset, int rndper)
+void __fastcall DRLG_L3PlaceRndSet(const unsigned char *miniset, int rndper)
 {
-	unsigned char *v2; // ebx
+	const unsigned char *v2; // ebx
 	int v3; // ecx
 	int v4; // eax
 	char *v5; // ecx
diff --git a/Source/drlg_l3.h b/Source/drlg_l3.h
index 4d2b52870..2347fa98a 100644
--- a/Source/drlg_l3.h
+++ b/Source/drlg_l3.h
@@ -31,8 +31,8 @@ void __cdecl DRLG_L3Pool();
 int __fastcall DRLG_L3SpawnEdge(int x, int y, int *totarea);
 int __fastcall DRLG_L3Spawn(int x, int y, int *totarea);
 void __cdecl DRLG_L3PoolFix();
-int __fastcall DRLG_L3PlaceMiniSet(unsigned char *miniset, int tmin, int tmax, int cx, int cy, bool setview, int ldir);
-void __fastcall DRLG_L3PlaceRndSet(unsigned char *miniset, int rndper);
+int __fastcall DRLG_L3PlaceMiniSet(const unsigned char *miniset, int tmin, int tmax, int cx, int cy, bool setview, int ldir);
+void __fastcall DRLG_L3PlaceRndSet(const unsigned char *miniset, int rndper);
 void __cdecl DRLG_L3Wood();
 bool __fastcall WoodVertU(int i, int y);
 bool __fastcall WoodVertD(int i, int y);
diff --git a/Source/drlg_l4.cpp b/Source/drlg_l4.cpp
index 52093512e..8c646d782 100644
--- a/Source/drlg_l4.cpp
+++ b/Source/drlg_l4.cpp
@@ -688,7 +688,7 @@ void __fastcall DRLG_L4(int entry)
 			{
 				if ( !v23 )
 				{
-					v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4USTAIRS, 1, 1, -1, -1, 1, 0);
+					v10 = DRLG_L4PlaceMiniSet(L4USTAIRS, 1, 1, -1, -1, 1, 0);
 					if ( v10 )
 					{
 						if ( gbMaxPlayers != 1 || (v11 = (unsigned char *)L4PENTA, quests[5]._qactive == 2) )
@@ -697,7 +697,7 @@ void __fastcall DRLG_L4(int entry)
 					}
 					goto LABEL_35;
 				}
-				v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4USTAIRS, 1, 1, -1, -1, 0, 0);
+				v10 = DRLG_L4PlaceMiniSet(L4USTAIRS, 1, 1, -1, -1, 0, 0);
 				if ( v10 )
 				{
 					if ( gbMaxPlayers != 1 || (v12 = (unsigned char *)L4PENTA, quests[5]._qactive == 2) )
@@ -709,24 +709,24 @@ void __fastcall DRLG_L4(int entry)
 			{
 				if ( !v23 )
 				{
-					v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4USTAIRS, 1, 1, -1, -1, 1, 0);
+					v10 = DRLG_L4PlaceMiniSet(L4USTAIRS, 1, 1, -1, -1, 1, 0);
 					if ( v10 )
 					{
 						if ( currlevel != 16 )
-							v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4DSTAIRS, 1, 1, -1, -1, 0, 1);
+							v10 = DRLG_L4PlaceMiniSet(L4DSTAIRS, 1, 1, -1, -1, 0, 1);
 						goto LABEL_31;
 					}
 LABEL_35:
 					++ViewX;
 					continue;
 				}
-				v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4USTAIRS, 1, 1, -1, -1, 0, 0);
+				v10 = DRLG_L4PlaceMiniSet(L4USTAIRS, 1, 1, -1, -1, 0, 0);
 				if ( v23 != 1 )
 				{
 					if ( v10 )
 					{
 						if ( currlevel != 16 )
-							v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4DSTAIRS, 1, 1, -1, -1, 0, 1);
+							v10 = DRLG_L4PlaceMiniSet(L4DSTAIRS, 1, 1, -1, -1, 0, 1);
 LABEL_46:
 						if ( v10 )
 						{
@@ -734,7 +734,7 @@ LABEL_46:
 							{
 								v22 = 1;
 LABEL_34:
-								v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4TWARP, 1, 1, -1, -1, v22, 6);
+								v10 = DRLG_L4PlaceMiniSet(L4TWARP, 1, 1, -1, -1, v22, 6);
 								goto LABEL_35;
 							}
 						}
@@ -744,9 +744,9 @@ LABEL_34:
 				if ( v10 )
 				{
 					if ( currlevel != 16 )
-						v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4DSTAIRS, 1, 1, -1, -1, 1, 1);
+						v10 = DRLG_L4PlaceMiniSet(L4DSTAIRS, 1, 1, -1, -1, 1, 1);
 					if ( v10 && currlevel == 13 )
-						v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4TWARP, 1, 1, -1, -1, 0, 6);
+						v10 = DRLG_L4PlaceMiniSet(L4TWARP, 1, 1, -1, -1, 0, 6);
 				}
 			}
 			++ViewY;
@@ -754,18 +754,18 @@ LABEL_34:
 		}
 		if ( !v23 )
 		{
-			v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4USTAIRS, 1, 1, -1, -1, 1, 0);
+			v10 = DRLG_L4PlaceMiniSet(L4USTAIRS, 1, 1, -1, -1, 1, 0);
 LABEL_31:
 			if ( !v10 || currlevel != 13 )
 				goto LABEL_35;
 			v22 = 0;
 			goto LABEL_34;
 		}
-		v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4USTAIRS, 1, 1, -1, -1, 0, 0);
+		v10 = DRLG_L4PlaceMiniSet(L4USTAIRS, 1, 1, -1, -1, 0, 0);
 		if ( v23 != 1 )
 			goto LABEL_46;
 		if ( v10 && currlevel == 13 )
-			v10 = DRLG_L4PlaceMiniSet((unsigned char *)L4TWARP, 1, 1, -1, -1, 0, 6);
+			v10 = DRLG_L4PlaceMiniSet(L4TWARP, 1, 1, -1, -1, 0, 6);
 		ViewX = 2 * setpc_x + 22;
 		ViewY = 2 * setpc_y + 22;
 	}
@@ -2832,181 +2832,167 @@ LABEL_12:
 	return 0;
 }
 
-bool __fastcall DRLG_L4PlaceMiniSet(unsigned char *miniset, int tmin, int tmax, int cx, int cy, int setview, int ldir)
+bool __fastcall DRLG_L4PlaceMiniSet(const unsigned char *miniset, int tmin, int tmax, int cx, int cy, int setview, int ldir)
 {
 	int v7; // ebx
 	int v8; // esi
 	int v9; // edi
 	int v10; // edx
-	int v11; // eax
-	int v13; // esi
-	int v14; // ebx
-	int v15; // ecx
-	int v16; // eax
-	int v18; // eax
-	int v20; // edi
+	int v11; // esi
+	int v12; // ebx
+	int v13; // edi
 	signed int i; // eax
-	int v22; // ecx
-	unsigned char v23; // dl
-	int v24; // eax
-	int v25; // edi
-	int v26; // edx
-	unsigned char v27; // bl
+	int v15; // ecx
+	unsigned char v16; // dl
+	int v17; // eax
+	int j; // ecx
+	int v19; // edi
+	int v20; // edx
+	char v21; // bl
 	bool result; // al
-	unsigned char *v29; // [esp+Ch] [ebp-28h]
-	int v30; // [esp+10h] [ebp-24h]
-	int v31; // [esp+14h] [ebp-20h]
-	int v32; // [esp+18h] [ebp-1Ch]
-	signed int v33; // [esp+1Ch] [ebp-18h]
-	int v34; // [esp+20h] [ebp-14h]
-	int v35; // [esp+24h] [ebp-10h]
-	int v36; // [esp+28h] [ebp-Ch]
+	const unsigned char *v23; // [esp+Ch] [ebp-28h]
+	int v24; // [esp+10h] [ebp-24h]
+	int v25; // [esp+14h] [ebp-20h]
+	int v26; // [esp+18h] [ebp-1Ch]
+	signed int v27; // [esp+1Ch] [ebp-18h]
+	int v28; // [esp+20h] [ebp-14h]
+	int v29; // [esp+24h] [ebp-10h]
+	int v30; // [esp+28h] [ebp-Ch]
 	int max; // [esp+2Ch] [ebp-8h]
-	//int v38; // [esp+30h] [ebp-4h]
-	int v39; // [esp+30h] [ebp-4h]
+	//int v32; // [esp+30h] [ebp-4h]
+	int v33; // [esp+30h] [ebp-4h]
 	int tmaxa; // [esp+3Ch] [ebp+8h]
 
 	v7 = miniset[1];
 	v8 = tmin;
 	v9 = *miniset;
-	v29 = miniset;
+	v23 = miniset;
 	v10 = tmax - tmin;
-	v34 = *miniset;
-	v35 = miniset[1];
+	v28 = *miniset;
+	v29 = miniset[1];
 	if ( v10 )
-	{
-		v30 = v8 + random(0, v10);
-	}
+		v24 = v8 + random(0, v10);
 	else
+		v24 = 1;
+	v25 = 0;
+	if ( v24 <= 0 )
 	{
-		v30 = 1;
-	}
-	v31 = 0;
-	if ( v30 <= 0 )
-	{
-		v13 = tmax;
-		v14 = 0; /* v38 */
+		v11 = tmax;
+		v12 = 0; /* v32 */
 	}
 	else
 	{
 		max = 40 - v9;
-		v36 = 40 - v7;
+		v30 = 40 - v7;
 		do
 		{
 			v11 = random(0, max);
-			v13 = v11;
-			v33 = 0;
-			v14 = random(0, v36);
-			v39 = v14;
+			v27 = 0;
+			v12 = random(0, v30);
+			v33 = v12;
 			do
 			{
-				if ( v33 >= 200 )
+				if ( v27 >= 200 )
 					return 0;
 				tmaxa = 1;
-				if ( v13 >= SP4x1 && v13 <= SP4x2 && v14 >= SP4y1 && v14 <= SP4y2 )
+				if ( v11 >= SP4x1 && v11 <= SP4x2 && v12 >= SP4y1 && v12 <= SP4y2 )
 					tmaxa = 0;
-				if ( cx != -1 )
+				if ( cx != -1 && v11 >= cx - v28 && v11 <= cx + 12 )
 				{
-					v15 = cx - v34;
-					if ( v13 >= cx - v34 && v13 <= cx + 12 )
-					{
-						v16 = random(0, max);
-						v13 = v16;
-						tmaxa = 0;
-						v39 = random(0, v36);
-						v14 = v39;
-					}
+					v11 = random(0, max);
+					tmaxa = 0;
+					v33 = random(0, v30);
+					v12 = v33;
 				}
-				if ( cy != -1 && v14 >= cy - v35 && v14 <= cy + 12 )
+				if ( cy != -1 && v12 >= cy - v29 && v12 <= cy + 12 )
 				{
-					v18 = random(0, max); /* cy - v35 */
-					v13 = v18;
+					v11 = random(0, max);
 					tmaxa = 0;
-					v39 = random(0, v36);
-					v14 = v39;
+					v33 = random(0, v30);
+					v12 = v33;
 				}
-				v20 = 0;
-				for ( i = 2; v20 < v35; ++v20 )
+				v13 = 0;
+				for ( i = 2; v13 < v29; ++v13 )
 				{
 					if ( tmaxa != 1 )
 						break;
-					v32 = 0;
-					if ( v34 > 0 )
+					v26 = 0;
+					if ( v28 > 0 )
 					{
-						v22 = v14 + v20 + 40 * v13;
+						v15 = v12 + v13 + 40 * v11;
 						do
 						{
 							if ( tmaxa != 1 )
 								break;
-							v23 = v29[i];
-							if ( v23 && dungeon[0][v22] != v23 )
+							v16 = v23[i];
+							if ( v16 && dungeon[0][v15] != v16 )
 								tmaxa = 0;
-							if ( dflags[0][v22] )
+							if ( dflags[0][v15] )
 								tmaxa = 0;
 							++i;
-							++v32;
-							v22 += 40;
+							++v26;
+							v15 += 40;
 						}
-						while ( v32 < v34 );
+						while ( v26 < v28 );
 					}
 				}
-				if ( !tmaxa && ++v13 == max )
+				if ( !tmaxa && ++v11 == max )
 				{
-					v13 = 0;
-					v39 = ++v14;
-					if ( v14 == v36 )
+					v11 = 0;
+					v33 = ++v12;
+					if ( v12 == v30 )
 					{
-						v39 = 0;
-						v14 = 0;
+						v33 = 0;
+						v12 = 0;
 					}
 				}
-				++v33;
+				++v27;
 			}
 			while ( !tmaxa );
-			if ( v33 >= 200 )
+			if ( v27 >= 200 )
 				return 0;
-			v24 = 0;
-			for ( miniset = (unsigned char *)(v34 * v35 + 2); v24 < v35; ++v24 )
+			v17 = 0;
+			for ( j = v28 * v29 + 2; v17 < v29; ++v17 )
 			{
-				v25 = v34;
-				if ( v34 > 0 )
+				v19 = v28;
+				if ( v28 > 0 )
 				{
-					v26 = v14 + v24 + 40 * v13;
+					v20 = v12 + v17 + 40 * v11;
 					do
 					{
-						v27 = v29[(_DWORD)miniset];
-						if ( v27 )
+						v21 = v23[j];
+						if ( v21 )
 						{
-							dflags[0][v26] |= 8u;
-							dungeon[0][v26] = v27;
+							dflags[0][v20] |= 8u;
+							dungeon[0][v20] = v21;
 						}
-						++miniset;
-						v26 += 40;
-						--v25;
+						++j;
+						v20 += 40;
+						--v19;
 					}
-					while ( v25 );
-					v14 = v39;
+					while ( v19 );
+					v12 = v33;
 				}
 			}
-			++v31;
+			++v25;
 		}
-		while ( v31 < v30 );
+		while ( v25 < v24 );
 	}
 	if ( currlevel == 15 )
 	{
-		quests[15]._qtx = v13 + 1;
-		quests[15]._qty = v14 + 1;
+		quests[15]._qtx = v11 + 1;
+		quests[15]._qty = v12 + 1;
 	}
 	result = 1;
 	if ( setview == 1 )
 	{
-		ViewX = 2 * v13 + 21;
-		ViewY = 2 * v14 + 22;
+		ViewX = 2 * v11 + 21;
+		ViewY = 2 * v12 + 22;
 	}
 	if ( !ldir )
 	{
-		LvlViewX = 2 * v13 + 21;
-		LvlViewY = 2 * v14 + 22;
+		LvlViewX = 2 * v11 + 21;
+		LvlViewY = 2 * v12 + 22;
 	}
 	return result;
 }
diff --git a/Source/drlg_l4.h b/Source/drlg_l4.h
index b57015438..4f453f051 100644
--- a/Source/drlg_l4.h
+++ b/Source/drlg_l4.h
@@ -50,7 +50,7 @@ void __cdecl L4firstRoom();
 void __fastcall L4drawRoom(int x, int y, int width, int height);
 void __fastcall L4roomGen(int x, int y, int w, int h, int dir);
 bool __fastcall L4checkRoom(int x, int y, int width, int height);
-bool __fastcall DRLG_L4PlaceMiniSet(unsigned char *miniset, int tmin, int tmax, int cx, int cy, int setview, int ldir);
+bool __fastcall DRLG_L4PlaceMiniSet(const unsigned char *miniset, int tmin, int tmax, int cx, int cy, int setview, int ldir);
 void __cdecl DRLG_L4FloodTVal();
 void __fastcall DRLG_L4FTVR(int i, int j, int x, int y, int d);
 void __cdecl DRLG_L4TransFix();