GameSpot - http://www.gamespot.com/gbc/action/commanderkeen/ Frank Provo reviews the Game Boy Color version. Includes screen shots and passwords. Score: 6.8 out of 10.
pocket.ign.com: Keen! - http://pocket.ign.com/articles/082/082671p1.html Offers rumours about a possible version of Id Software's Commander Keen game for the Game Boy Color.
The Commander Keen Web Page - http://www.angelfire.com/hi5/justinj88/ Offers cheats, hints, pictures, downloads, and guestbook.
Cerebral Cortex 314 - http://www.classicgaming.com/cc314/ Information, screen shots, downloads, an ASCII art section, level editor, and level sets for Keen 1.
Beyond the Pogo - http://spatang.com/ck/ Offers fan art, newsletter, encyclopedia, and editing tools.
Commander Keen Fan Site - http://www.commander-keen.com/ Includes information, screenshots, downloads, cheats and links.
The Commander Keen Wiki - http://www.shikadi.net/keenwiki/ Fan-maintained reference to the entire Commander Keen universe, including mods and fan made games.
Can't Get Enough Commander Keen - http://www.al-morrin.co.uk/samira/keen/index.php Including character lists, cheats, and hints.
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