diff --git a/src/game/credits.c b/src/game/credits.c
index fd4d50518..5de55450d 100644
--- a/src/game/credits.c
+++ b/src/game/credits.c
@@ -1079,7 +1079,12 @@ void creditsResetSlides(void)
 
 		g_CreditsData->coreteammap[i + 1] = pool[index];
 
+#ifdef AVOID_UB
+		// don't overflow `pool`
+		while (index < NUM_CORE_TEAM - i - 1) {
+#else
 		while (index < NUM_CORE_TEAM - i) {
+#endif
 			pool[index] = pool[index + 1];
 			index++;
 		}
diff --git a/src/game/padhalllv.c b/src/game/padhalllv.c
index 7d55e2be9..2dca0ae16 100644
--- a/src/game/padhalllv.c
+++ b/src/game/padhalllv.c
@@ -76,9 +76,15 @@ void navSetSeed(u32 upper, u32 lower)
 struct waypoint *waypointFindClosestToPos(struct coord *pos, RoomNum *rooms)
 {
 	struct waypoint *closest = NULL;
+#ifdef AVOID_UB
+	 // prevent bgRoomGetNeighbours or roomsAppend from writing out of bounds
+	RoomNum allrooms[31];
+	RoomNum neighbours[11];
+#else
 	RoomNum allrooms[30];
-	s32 candlen = 0;
 	RoomNum neighbours[10];
+#endif
+	s32 candlen = 0;
 	s32 i;
 	s32 j;
 	struct waypoint *candwaypoints[10];
@@ -94,8 +100,8 @@ struct waypoint *waypointFindClosestToPos(struct coord *pos, RoomNum *rooms)
 	allrooms[i] = -1;
 
 	for (i = 0; rooms[i] != -1; i++) {
-		bgRoomGetNeighbours(rooms[i], neighbours, ARRAYCOUNT(neighbours));
-		roomsAppend(neighbours, allrooms, ARRAYCOUNT(allrooms));
+		bgRoomGetNeighbours(rooms[i], neighbours, 10);
+		roomsAppend(neighbours, allrooms, 30);
 	}
 
 	if (g_StageSetup.waypoints != NULL) {
diff --git a/src/game/player.c b/src/game/player.c
index 5e761a3d5..e5028c148 100644
--- a/src/game/player.c
+++ b/src/game/player.c
@@ -243,7 +243,11 @@ f32 playerChooseSpawnLocation(f32 chrradius, struct coord *dstpos, RoomNum *dstr
 	s32 stack3[2];
 	RoomNum tmppadrooms[2];
 	f32 bestsqdist;
+#ifdef AVOID_UB
+	RoomNum neighbours[21]; // prevent bgRoomGetNeighbours from writing out of bounds
+#else
 	RoomNum neighbours[20];
+#endif
 
 	// Iterate all spawn pads and populate the category arrays
 	for (p = 0; p < numpads; p++) {
diff --git a/src/game/training.c b/src/game/training.c
index bdc6f20c7..148c24912 100644
--- a/src/game/training.c
+++ b/src/game/training.c
@@ -1248,9 +1248,17 @@ void frEndSession(bool hidetargets)
 	s32 j;
 	s16 propnums[256];
 	s16 *propnumptr;
+#ifdef AVOID_UB
+	RoomNum rooms[21];
+#else
 	RoomNum rooms[20];
+#endif
 	u32 stack1;
+#ifdef AVOID_UB
+	RoomNum rooms2[11]; // prevent bgRoomGetNeighbours from writing out of bounds
+#else
 	RoomNum rooms2[10];
+#endif
 	u32 stack2;
 
 	if (g_FrDataLoaded) {
diff --git a/src/game/weather.c b/src/game/weather.c
index cc2458d89..917e4d436 100644
--- a/src/game/weather.c
+++ b/src/game/weather.c
@@ -856,7 +856,11 @@ Gfx *weatherRenderRain(Gfx *gdl, struct weatherdata *weather, s32 arg2)
 		u32 stack2;
 		struct coord distcamtobbmax;
 		struct coord distcamtobbmin;
+#ifdef AVOID_UB
+		RoomNum neighbours[21];
+#else
 		RoomNum neighbours[20];
+#endif
 
 		particledata = weather->particledata[arg2];
 		numtris = 0;
@@ -1063,7 +1067,7 @@ Gfx *weatherRenderRain(Gfx *gdl, struct weatherdata *weather, s32 arg2)
 			}
 
 			for (scale = 1.0f, t = 0; t < numtestrooms; t++) {
-				numneighbours = bgRoomGetNeighbours(testrooms[t], neighbours, ARRAYCOUNT(neighbours));
+				numneighbours = bgRoomGetNeighbours(testrooms[t], neighbours, 20);
 
 				for (n = 0; n < numneighbours; n++) {
 					if (g_Rooms[neighbours[n]].flags & ROOMFLAG_ONSCREEN) {
@@ -2872,7 +2876,11 @@ Gfx *weatherRenderSnow(Gfx *gdl, struct weatherdata *weather, s32 arg2)
 	s32 i; // 184
 	struct coord sp178;
 	struct coord sp16c;
+#ifdef AVOID_UB
+	RoomNum sp144[21]; // prevent bgRoomGetNeighbours from writing out of bounds
+#else
 	RoomNum sp144[20];
+#endif
 	struct coord sp124;
 	struct coord sp118;
 	f32 f26;
@@ -3003,7 +3011,7 @@ Gfx *weatherRenderSnow(Gfx *gdl, struct weatherdata *weather, s32 arg2)
 
 	// 4c54
 	for (i = 0; i < sp1268; i++) {
-		numneighbours = bgRoomGetNeighbours(sp126c[i], sp144, ARRAYCOUNT(sp144));
+		numneighbours = bgRoomGetNeighbours(sp126c[i], sp144, 20);
 
 		for (j2 = 0; j2 < numneighbours; j2++) {
 			a0 = true;
diff --git a/src/include/types.h b/src/include/types.h
index 47fb724d1..026e37808 100644
--- a/src/include/types.h
+++ b/src/include/types.h
@@ -3993,10 +3993,7 @@ struct gamefile {
 };
 
 struct mpchrconfig {
-	/*0x00*/ char name[12]; // up to 10 visible chars plus line break plus null byte
-	/*0x0c*/ u8 unk0c;
-	/*0x0d*/ u8 unk0d;
-	/*0x0e*/ u8 unk0e;
+	/*0x00*/ char name[15];
 	/*0x0f*/ u8 mpheadnum;
 	/*0x10*/ u8 mpbodynum;
 	/*0x11*/ u8 team;
diff --git a/src/lib/mp3/decoder.c b/src/lib/mp3/decoder.c
index 5751abbb0..11383b68d 100644
--- a/src/lib/mp3/decoder.c
+++ b/src/lib/mp3/decoder.c
@@ -2736,8 +2736,8 @@ bool mp3dec000427d8(struct asistream *stream, u32 gr)
 	f32 *sp0c = stream->unk4664[0][0].unk00;
 	s32 i = 0;
 
-	if (stream->window_switching[gr][0] && stream->window_switching[gr][2] == 2) {
-		if (stream->window_switching[gr][4]) {
+	if (stream->window_switching[gr][0] && stream->block_type[gr][0] == 2) {
+		if (stream->mixed_block_flag[gr][0]) {
 			while (i++ < 36) {
 				*(sp10++) = *(sp0c++);
 			}