Get Duke Nukem3D. *WAY* better. There's a shareware version, I released a few years back. I don't know if it's still available. I have a copy of it, though, if anyone wants to host it. Don't {bleep} about all the dos files, 'cos I just packaged it with an unpacked shareware release. It was the only way I could think of, without violating 3DRealm' EULA. The original coder on the project dropped out and I haven't heard from him, since.
Note, I just packaged the shareware version and made sure it ran. (Only "bug" is the fact it looks for Plutonium Wav files that aren't there, but doesn't crash.) :-D
