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 rewarding. It felt like returning to my early teenage years, debugging and experimenting with C and assembly code on a MS-DOS computer. I learned a great deal about the hardware of that era and the challenges developers faced in getting everything to work together. The result is a 214-page, full-color book that explains in great detail what it was like to develop games in the late eighties and early nineties.…