Nice, I'm surprised it took this long! My first experience of playing Quake 1 in my home was an unauthorized source port which ran in System 7, I believe was called "HackQuake", ported from stolen source code from CrackDotCom apparently[0][1] .. For me as a kid getting insanely impatient to play Quake, this was a godsend! Even if the performance was brutal and firing a rocket caused the framerate to halve. Played it…
When I got the game and looked at the box, I was heartbroken. But I decided, why not put in the disk anyway. I did the Get Info on the app, and lo and behold, Lucas Arts had left what was probably a totally untested 68k slice in the binary. Double-clicked it, and I could play without a problem. Sure I had to play it in a tiny 320x240 window, but that extra 16 MB of RAM and extra 25 MHz made it playable.