Dungeons of dredmor is great. So hard, so much experimentation for a 2d turn based dungeon crawler. And it isn't turn based in the classic sense, but each action (move 1 square, attack, cast) causes npcs to do 1 action also. However, you can click to move somewhere 10 squares away and your character can move there all at once, but any npcs will also do 10 actions.
It also has permadeath and traps, a scoring system and randomized levels. Sad to say I haven't got past 3rd floor of dungeon, on normal, out of 15 floors (counting the expansion).
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