Commander Keen originally started life as a full PC port of Super Mario Bros 3 after John D. Carmack created a demo of the first level entitled "Dangerous Dave in Copyright Infringement" and it was suggested that he finish it. They took the idea to Nintendo who was impressed but had no intention of porting their game to PC. Rather than throw away their hard work, they reworked it into an original title: Commander Keen.
Submitted By: Jerrynsteph4eva
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