Just released port of Wolfenstein 3D for Commodore 64! This is running on an NTSC Rev B "Breadboard" motherboard inside a 64C case.
Using two cartridges: A CMD SuperCPU 64 V2 w/16MB "Super RAM" and an IDE64 3.4 running v0.897 firmware. Installed using d2m plugin, a CMD FD-2000, and a uIEC (CF version). Wolfenstein 3D for C64 available on CSDB. Mad props to the people who ported this!!! Frame rate in game here about 6 FPS, which is better than I expected. It varies wildly depending on mode and selected view window size.
Anywhere from 4-5 FPS in 16 color, max size, w/sampled sound to 22 FPS in 4 color, min size, "PC Speaker" sound effects. Technical observations: As far as I can tell, the sampled sounds and FLI graphics mode are, surprisingly, over half of the CPU load. Logically this would be due to the SuperCPU having to update the C64 much more often at the C64's native 1MHz bus speed.
Even the menu drops speed significantly in this mode. The game itself in the basic 4 color, "PC speaker" sound, runs at a very playable frame rate. That is insane considering the original game was optimized for 32-bit Intel at a time when most people were in the 33MHz or higher clock speed (40-66MHz common), and when PCs generally ran an 8MHz bus. The CMD SuperCPU is a 20MHz 16-bit speed-up cartridge for the stock C64 (and its 1MHz bus). This is having to do all the same scene rendering in 3D space, and also target the C64's odd graphics memory layout and color restrictions.