QBasic Tunnel Vortex
One of my old routines from mid-late 90s.
It ran fine on a 486, however I had to compile it using FirstBasic for performance. The compiled .exe was a pain to get to work again. It finally ran using VirtualBox/Win98. Recorded by ObsStudio.
Music:
Chopper, Kim Christensen (Future Freak), 1989 Flexible Arts
http://hvsc.c64.org/