For those of you that might have played the Eye of the Beholder or Dungeon Master series, or that just like Dungeon Crawler RPG, yesterday saw the release of Legend of Grimrock (http://www.grimrock.net/).
Your party of four prisoners are thrown down the depth of mount Grimrock. If they can escape to the base of the spire, they win their freedom but no one as ever survived the perils of the dungeon.
It is a modern rendition of a classic genre, it even features an Old School mode which disables the auto-map and encourages you to take out a pad of graph paper and pencil.