Desktop Dungeons

Desktop Dungeons is a quick-play, roguelike-like puzzle game that gives you 10-20 minutes of dungeon-crawling action per serving. Casual players can enjoy endless coffee-break gaming sessions in infinitely random dungeons, while hardcore enthusiasts can unearth the game's subtleties and tackle challenges of unrealistic viciousness. Down all paths lies frequent death, easy accessibility and the urge to play just one more dungeon. (http://www.desktopdungeons.net/)