Fun fact, Keen was originally a Mario port but Nintendo didn't want it. https://en.wikipedia.org/wiki/Commander_Keen#Creation_and_development https://en.wikipe

Fun fact, Keen was originally a Mario port but Nintendo didn't want it. https://en.wikipedia.org/wiki/Commander_Keen#Creation_and_development https://en.wikipedia.org/wiki/Commander_Keen#Creation_and_de...