Since I recently upgraded to a 3dfx video card, I downloaded the 3dfx patch as well. I had a shaky start with a beta Mesa version, but everything seems alright under Mesa 3.2. There is a problem with using a 3dfx card though. The monster movement can be controlled by the mouse or keyboard. For the mouse movement, if the pointer is above the center of the screen, the monster moves forward.
Backward movement is caused by moving the pointer below the screen center.
Being to the right or left of the center turns in the appropriate direction. Unfortunately the full screen mode of Mesa for 3dfx does not draw the mouse pointer. I initially intended to look into this issue and discuss some of the challenges in designing a 3D game. Perhaps even add an option for drawing the pointer to solve the 3dfx problem. The Muses had a different plan in mind, however.