No really, it’s Catacomb 3-D: The Descent. First ported to 32-bit SDL by NotStiller. Me being the person I am, I fixed a slight bug regarding binary files on Windows, and MS-DOS, then cleaned up some of the C++ syntax (yuck!) making it far more C89 friendly. And of course, hot off the heels of DooM for GO32 DPMI, I was able to get it to build and run using GCC 1.39 and GO32.
I know most people really won’t care, but I found it kind of interesting. I should try to see if it’ll run on actual hardware, just as a comparison of tightly optimized Borland C++ / Assembly vs 100% pure C on DJGPP. The best tech of 1991 for sure!
At current I just put the source up, you can git it here.