But this time, it’s Wolf3D that has been ported on a platform that has never been intended to make it run: the GameBoy Color! Wolf3D had already been published on the GameBoy Advance (GBA) a long time ago, but never on the older handheld console.
And as you can see, the result is very good!
But as the hardware of the console was far too slow to make it run, a modder called Anders Granlund got the idea to add an ARM processor to the cartridge itself in order to handle the graphic processing. You can read more technical details about this amazing job on his site.