Yes the 68k version WORKS also , but its not really fast compared to the ppc i have (which i still think is slow..well not superfast anyway)
on my ppc (a1260/66/240) (thats 603) i get 26,2 -> 26.4 fps in quake 2 in 640x480, i have done some tweaking also to get the best speed ..
but i havent been able to see this game on 604 ppc's like a4k or a3k's etc, i am so sure it flies on them, a 604 ppc is alot better than
603 atleast for everything i have seen it do...hmm i think i will go buy one

(and a4k)
cheers