Gamez.com: Colossal Cave  
   Gamez.com's collection of Colossal Cave cheats and solutions.
   http://gamez.com/games/pc/colossalcave.html

Colossal Cave Adventure Forum  
   A place to discuss the Crowther and Woods "Adventure" game in all its various versions.
   http://forums.about.com/xyzzy

Colossal Cave Mazes  
   A homage to some of the more treacherous trails the Colossal Cave contained.
   http://www.quietfire.com/maze/

Delphi: Colossal Cave Adventure forum  
   Forum for discussion of Adventure in its various forms.
   http://forums.delphiforums.com/xyzzy/start/

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."
   http://www.matthewmurray.net/Reviews/ComputerGames/Adventure.html

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."
   http://www.sentex.net/~datanguayh/games/adventure_rev.html

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.
   http://www.mipmip.dsl.pipex.com/

Adventure server  
   Play online. BSD version (requires Java or Telnet).
   http://www.forkexec.com/html/play-advent.html

Prof. Dennis G. Jerz: Colossal Cave Adventure  
   About the history of the game and examples from some different versions.
   http://jerz.setonhill.edu/if/canon/Adventure.htm