I don't have a physical C64 anymore and play all my games through emulation. I was able to get Metal Dust working in VICE so I think I'm reasonably competent. Comments below seem to be mostly about FlashCarts on OG C64 or reproductions like the Maxi -- what about VICE running on a Windows PC? Would it run Soul Force?
CCS64 V3.9.2 Emulator
Soul Force GS64 game File (Security Certificate)
Go to OPTIONS and click INPUT
Calibrate Joysticks press D-PAD on joypad Press ESC
Calibrate JoyAdapter press FIRE BUTTONS on joypad Press ESC
Click Video in OPTIONS to adjust your preferred screen size
Press F10 When you want to quit CCS64
Works great, Have Fun :)