Game Engine White Papers: Commander Keen

March 28, 2026 Game Engine White Papers Commander Keen Finally, The Game Engine White Papers: Commander Keen is here, more than 35 years after the original game was released in December 1990. The book is available in two formats: - Paper version on Amazon (USA, NL, and many more). - Digital high-res PDF here, free of charge. For anyone interested, I also made the books' source code available on GitHub. It took me over three years to complete the book, and the entire experience was immensely rewa