Dungeon Master II: The Legend of Skullkeep

Dungeon Master 2: The Legend of Skullkeep
Developer: FTL Games Publishers: FTL Games, Interplay Platform: DOS Released in US: December 23, 1993 This game has unused areas.

Dungeon Master II is a 3D dungeon crawler where you make steaks out of dinos and worms, avoid (sometimes unsuccessfully) getting struck by lightning (from the sky, minion, wind elemental, etc. it's all the same), solve some puzzles, get your stuff stolen constantly, bump into walls or have walls bump you into a pit, dealing with greedy shopkeepers (and their assassin guards should you mistreat them), all the while the BBEG sends a stream of lightning-throwing attack minions at you.

Unused area

A small portion of the first floor of the tower of Skullkeep has two tiles in the very top left corner. Neither of them have any items. Attempting to walk to the right tile causes the player to warp back to the left tile. Throwing or casting spells into the right tile causes the projectile to vanish.