IIRC the developer made the SNES version of Doom from the ground-up as well, no source code.

Surprisingly enough, I remember the best console port of Doom being the Atari Jaguar version for a long time before the PS1 version hit.

I still look back so fondly to that time because they absolutely pushed the SNES to the limit and then some with games like Killer Instinct, Donkey Kong Country, Super Mario RPG.

Oh, and Doom. Unlike the other games I mentioned, I wouldn’t consider Doom on the SNES as good – but the fact they were able to get a playable Doom on the SNES is an engineering marvel. Accomplishments like that from the old school game designers are truly so impressive.