They certainly have talent. This type of thing is not easy to pull off. I tried doing it when I first learned BASIC on the Commodore 64 using the built in graphics, I had no clue they were PETSCII or what they were called. I just knew certain key combinations created basic graphics on the screen.
I failed horribly but it was fun to try.
I could never create something on this level, this is beyond amazingly awesome.
RE: Castle Wolfenstein 3D Demade Using PETSCII