The Great Underground Empire (Zork)
Back when text adventures were all the rage, the most compelling game worlds existed inside the player's imagination. One of the best games of this era was Zork, the world's first dungeon-crawler. Originally appearing in 1980 on the humble Apple II, Zork enthralled early gamers with its labyrinthine mazes, treacherous traps and sparkling treasures.
Last year, Zork was included as an unlockable easter egg in
Call of Duty: Black Ops. Despite a complete lack of visuals, Zork's world is by far the more vibrant of the two. Beware the grue.