A strange little side quest
Put Cotyledon next to the history of action games and a few unexpected connections appear. Doom changed game design and distribution in 1993 by separating its engine from content and spreading widely through shareware. The broader history adds one more wrinkle. Modern chess traces back to the Indian game chaturanga, recorded around the sixth century and built around pieces representing parts of an army. Not bad for a few facts hiding behind a Play button.