@CU_AMiGA
Oh yes, it runs quite nicely and loads in less than a minute; the problem is playability (speed), maybe get a couple frames per second. I take back what I said about Clickboom's version, it's their 060 version that I remember being not too stable.
I'll check out GLQuake 68K and let you know how fast it is, or if it works at all (it may need 3D hardware). I only have a SVGA card (PicassoII+) in the A2000. The only Zorro II 3D capable card is the Cybervision3D/Virge card from Phase 5. Hopefully, there is a software renderer but that is probably going to be slow.
As for the Graffiti card, it plugs into the RGB external port on all Amigas (including A600) and gives chunky modes. afaik there is no Quake support for this card. Some earlier 2D games (NemacIV, Gloom) do work with it. Perhaps a driver could be written but again it would be probably very sloooooww with Quake.