MVG has a recent video up where he ports Heart of Darkness to the original Xbox which gives a bit of insight - https://www.youtube.com/watch?v=f4rNhTTwGgk https

MVG has a recent video up where he ports Heart of Darkness to the original Xbox which gives a bit of insight - https://www.youtube.com/watch?v=f4rNhTTwGgk https://www.youtube.com/watch?v=f4rNhTTwGgk And in the case of SNES Doom, Randy didn't see any of the Doom source code. He found an online guide describing the Doom WAD files and then wrote a Doom prototype from scratch, on an Amiga using his own tool set. Insanely talented guy.