Dungeon Master for the new millenium. This is a masterpiece.
Late nights are the norm with this game. There is nothing better than crawling through the dungeon late at night with the lights off in the room and having your soul scared out of you. Without the flash of some of today's games, Legend of Grimrock manages to immerse one so completely that when someone walks into a room whilst one is in the middle of a long session of play, you may be forgiven for thinking that reality is the false realm for a moment and that the game is the true world in which you occupy. Have fun and don't worry, you won't regret this one!