A true classic.
I know that a lot of people call this crap, but they don't realize that this game has been done by a 12-year old in 1992! Back then, it sure wasn't easy to make such games! The creator, Ken Silverman (of BUILD fame), had to figure out each aspect of 3D-game programming by HIMSELF! Can you really believe this engine actually blew me away?!
He also did fantastic MUSIC, very emotional... It will be in your mind for a few hours, after you've played this...
It is waaaaaay too hard, even on easy mode! Also, the game has a really sad atmosphere, it even nearly got me crying.
The Bottom Line
You should check it out, it's definitely history! The first Wolf3D clone ever, programmed by a 12-year old... This is actually the very engine that would turn into BUILD some years after, and would become the base of great games such as Duke Nukem 3D and Blood! Oh, and you'll probably need some DOSBox or something if you want to hear the sound properly.
NOTE: As no-one has noted this before, I'll take the honors... This game is actually freeware, now. Ken has released it with permission of Epic back in 1999! Download this game at http://advsys.net/ken/. Good luck with it! Pure enjoyment guaranteed!