Colossal Cave Adventure page, The History of the original 'Adventure' by Crowther and Woods, information about the real Colossal Cave, hints, and downloads of various versions of the game.
A-code Adventures and some adventure history Mike Arnautov's site includes A-code language materials, downloads of Mike's two expansions of the original Adventure, and some oter downloads of historical Adventure interest.
Adventure server Play online. BSD version (requires Java or Telnet).
Colossal Cave Adventure Forum A place to discuss the Crowther and Woods "Adventure" game in all its various versions.
Colossal Cave Mazes A homage to some of the more treacherous trails the Colossal Cave contained.
David Tanguay's Review Rated -2 on -5 to +5 scale. "If there was a good story to go with it, the first adventure game would have also been one of the best."
Matthew Murray's Review Capsule review. "Adventure is worth playing today for the nostalgia and for the fact that well-designed games never do go out of style."