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Commander Keen
Books: GAME BOY Secret Codes - Secret Codes 2003 - Game Boy Games Secrets

Note: You must have a 2.1 or higher version of the Game Shark to use these
codes in a Game Boy Color system.

91633DC9     Infinite Continues
916334C9     Infinite Lives
91FF95C9     Have All Keys

91FF3AC9     Have All 3 Crystals
91FF3BC9

917F35C9
919636C9     Max Score
919837C9