diff --git a/data/monstergen.lua b/data/monstergen.lua
index 2669234..55c681a 100644
--- a/data/monstergen.lua
+++ b/data/monstergen.lua
@@ -42,7 +42,8 @@ local behaviour = {
 	normal = 1,
 	hostile = 2,
 	guerilla = 3,
-	coward = 4
+	coward = 4,
+	sentinel = 5
 }
 
 local stats = {
@@ -60,6 +61,13 @@ local stats = {
 		def = 0,
 		speed = 1
 	},
+	misc = {
+		hp = 18,
+		dmg = 2,
+		atk = 0,
+		def = 0,
+		speed = 1
+	},
 	dog = {
 		hp = 12,
 		dmg = 2,
@@ -134,6 +142,12 @@ local pests = {
 	--{ texturePaths.pest0, texturePaths.pest1, 48, 112 },
 }
 
+local misc = {
+	{ texturePaths.misc0, texturePaths.misc1, stats.misc,	0,	0, "A Giant Black Rat", behaviour.sentinel },
+	{ texturePaths.misc0, texturePaths.misc1, stats.misc,	16,	0, "A Giant White Rat", behaviour.sentinel },
+	{ texturePaths.misc0, texturePaths.misc1, stats.misc,	64,	0, "An Owl Bear", behaviour.sentinel },
+}
+
 local undead = {
 	-- UNDEAD
 	--{ texturePaths.undead0, texturePaths.undead1,   0,  0, "", behaviour.normal };
@@ -179,7 +193,7 @@ local reptile = {
 }
 
 local platino = {
-	{ texturePaths.reptile0, texturePaths.reptile1, stats.platino,  48, 12*16, "Platino", behaviour.hostile };
+	{ texturePaths.reptile0, texturePaths.reptile1, stats.platino,  48, 12*16, "Platino", behaviour.sentinel };
 }
 
 local demon = {
@@ -217,26 +231,31 @@ local enemies = {}
 if(CURRENT_LEVEL > 0 and CURRENT_LEVEL < 10) then
 	if (CURRENT_LEVEL == 1) then
 		enemies = concat(enemies, pests)
+		enemies = concat(enemies, misc)
 		enemies = concat(enemies, dogs)
 	elseif (CURRENT_LEVEL > 5) then
 		enemies = {}
 		enemies = concat(enemies, demon)
 		enemies = concat(enemies, undead)
 		enemies = concat(enemies, reptile)
+		enemies = concat(enemies, misc)
 	elseif (CURRENT_LEVEL > 3) then
 		enemies = {}
 		enemies = concat(enemies, undead)
 		enemies = concat(enemies, reptile)
+		enemies = concat(enemies, misc)
 		enemies = concat(enemies, dogs)
 	elseif (CURRENT_LEVEL > 2) then
 		enemies = {}
 		enemies = concat(enemies, undead)
 		enemies = concat(enemies, reptile)
+		enemies = concat(enemies, misc)
 		enemies = concat(enemies, dogs)
 	elseif (CURRENT_LEVEL > 1) then
 		enemies = {}
 		enemies = concat(enemies, undead)
 		enemies = concat(enemies, reptile)
+		enemies = concat(enemies, misc)
 		enemies = concat(enemies, dogs)
 	end
 end
@@ -247,6 +266,9 @@ end
 
 function module.add_monster_to_room(map, roomx, roomy)
 	local count = random(3)
+	if (CURRENT_LEVEL > 3) then
+		count = random(4)
+	end
 	for i=0,count do
 		local x = (roomx * 512) + (random(13) + 1) * 32
 		local y = (roomy * 384) + (random(9) + 1) * 32
diff --git a/src/main.c b/src/main.c
index d041bc2..14406ad 100644
--- a/src/main.c
+++ b/src/main.c
@@ -468,8 +468,6 @@ run_game(void)
 
 	if (gGameState == IN_GAME_MENU)
 		menu_update(inGameMenu, &input);
-	if (gGameState != PLAYING && gGameState != IN_GAME_MENU)
-		return;
 
 	map_clear_dead_monsters(gMap, gPlayer);
 	map_clear_collected_items(gMap);
@@ -556,9 +554,9 @@ run_game(void)
 		gui_event_message("You died!");
 		mixer_play_effect(SPLAT);
 		gGameState = GAME_OVER;
+	} else {
+		check_next_level();
 	}
-
-	check_next_level();
 }
 
 static void
diff --git a/src/monster.c b/src/monster.c
index 1e13e18..9577cf7 100644
--- a/src/monster.c
+++ b/src/monster.c
@@ -48,6 +48,11 @@ monster_set_sprite_clip_for_current_state(Monster *m)
 		case SCARED:
 			m->stateIndicator.sprite->clip = CLIP16(16 * 12, 16 * 3);
 			break;
+		case SLEEPING:
+			m->stateIndicator.sprite->clip = CLIP16(16 * 10, 16 * 4);
+			break;
+		case SCANNING:
+			m->stateIndicator.sprite->clip = CLIP16(16 * 13, 16 * 4);
 		default:
 			break;
 	}
@@ -70,14 +75,12 @@ static void
 monster_behaviour_check_post_hit(Monster *m)
 {
 	switch (m->behaviour) {
-		case NORMAL:
-			monster_state_change(m, AGRESSIVE);
-			break;
 		case PACIFIST:
 		case COWARD:
 			monster_state_change(m, SCARED);
 			break;
 		default:
+			monster_state_change(m, AGRESSIVE);
 			break;
 	}
 }
@@ -94,10 +97,31 @@ monster_behaviour_check_post_attack(Monster *m)
 	}
 }
 
+static void
+handle_sentinel_behaviour(Monster *m, RoomMatrix *rm)
+{
+	if (m->state.current == AGRESSIVE)
+		return;
+
+	Position monsterPos = m->sprite->pos;
+	if (!position_in_room(&monsterPos, &rm->roomPos))
+		return;
+
+	monsterPos = position_to_matrix_coords(&monsterPos);
+	Position playerPos = rm->playerRoomPos;
+	unsigned int dx = abs(playerPos.x - monsterPos.x);
+	unsigned int dy = abs(playerPos.y - monsterPos.y);
+	if (dx < 3 && dy < 3)
+		monster_state_change(m, AGRESSIVE);
+	else if (dx <= 3 && dy <= 3)
+		monster_state_change(m, SCANNING);
+	else
+		monster_state_change(m, SLEEPING);
+}
+
 static void
 monster_behaviour_check(Monster *m, RoomMatrix *rm)
 {
-	UNUSED(rm);
 	switch (m->behaviour) {
 		case GUERILLA:
 			if (m->state.stepsSinceChange > 8
@@ -105,6 +129,9 @@ monster_behaviour_check(Monster *m, RoomMatrix *rm)
 				monster_state_change(m, AGRESSIVE);
 			}
 			break;
+		case SENTINEL:
+			handle_sentinel_behaviour(m, rm);
+			break;
 		default:
 			break;
 	}
@@ -312,12 +339,12 @@ monster_move(Monster *m, RoomMatrix *rm)
 {
 	Position monsterRoomPos;
 
+	monster_behaviour_check(m, rm);
+
 	monsterRoomPos = position_to_matrix_coords(&m->sprite->pos);
 	rm->spaces[monsterRoomPos.x][monsterRoomPos.y].occupied = false;
 	rm->spaces[monsterRoomPos.x][monsterRoomPos.y].monster = NULL;
 
-	monster_behaviour_check(m, rm);
-
 	switch (m->state.current) {
 		case PASSIVE:
 			monster_drunk_walk(m, rm);
@@ -329,6 +356,8 @@ monster_move(Monster *m, RoomMatrix *rm)
 			monster_coward_walk(m, rm);
 			break;
 		case STATIONARY:
+		case SLEEPING:
+		case SCANNING:
 		default:
 			break;
 	};
@@ -360,7 +389,7 @@ monster_update(Monster *m, UpdateData *data)
 			return;
 
 		m->stateIndicator.shownOnPlayerRoomEnter = true;
-		if (m->state.current != PASSIVE)
+		if (m->state.current != PASSIVE && m->state.current != STATIONARY)
 			m->stateIndicator.displayCount = 5;
 	} else {
 		m->stateIndicator.shownOnPlayerRoomEnter = false;
@@ -471,6 +500,9 @@ monster_set_behaviour(Monster *m, MonsterBehaviour behaviour)
 		case COWARD:
 			m->state.current = AGRESSIVE;
 			break;
+		case SENTINEL:
+			m->state.current = SLEEPING;
+			break;
 		case PACIFIST:
 		case NORMAL:
 		default:
diff --git a/src/monster.h b/src/monster.h
index 64eef50..6930d5e 100644
--- a/src/monster.h
+++ b/src/monster.h
@@ -33,14 +33,17 @@ typedef enum {
 	NORMAL,
 	HOSTILE,
 	GUERILLA,
-	COWARD
+	COWARD,
+	SENTINEL
 } MonsterBehaviour;
 
 typedef enum {
 	PASSIVE,
 	AGRESSIVE,
 	SCARED,
-	STATIONARY
+	STATIONARY,
+	SLEEPING,
+	SCANNING
 } StateType;
 
 typedef struct {
diff --git a/src/player.c b/src/player.c
index 52f65a0..361be33 100644
--- a/src/player.c
+++ b/src/player.c
@@ -411,9 +411,6 @@ player_monster_kill_check(Player *player, Monster *monster)
 void
 player_hit(Player *p, unsigned int dmg)
 {
-	if (p->stats.hp <= 0) {
-		dmg = 200;
-	}
 	if (dmg > 0) {
 		Position pos = p->sprite->pos;
 		pos.x += 8;
@@ -455,6 +452,8 @@ player_reset_steps(Player *p)
 void player_update(UpdateData *data)
 {
 	Player *player = data->player;
+	if (player->stats.hp <= 0)
+		return;
 
 	check_skill_activation(data);
 	if (!check_skill_trigger(data))
diff --git a/src/roommatrix.c b/src/roommatrix.c
index e706d63..0e57c8a 100644
--- a/src/roommatrix.c
+++ b/src/roommatrix.c
@@ -282,5 +282,13 @@ roommatrix_reset(RoomMatrix *m)
 
 void roommatrix_destroy(RoomMatrix *m)
 {
+	for (int i = 0; i < MAP_ROOM_WIDTH; ++i) {
+		for (int j = 0; j < MAP_ROOM_HEIGHT; ++j) {
+			RoomSpace *space = &m->spaces[i][j];
+			while (space->items)
+				item_destroy(linkedlist_pop(&space->items));
+		}
+	}
+
 	free(m);
 }