The source code for one of the worse port of Doom has been released by the author as well as an explanation why. Interesting indeed. github site: https://github.com/Olde-Skuul/doom3do Authors notes: https://github.com/Olde-Skuul/doom3do/blob/master/README.md Original SlashDot article: http://games.slashdot.org/story/14/11/30/2342213/doom-3do-source-released-on-github