Marathon by Bungie is the most awesome first-person, 3D shoot 'em up (the aliens) game for the mac period. With good graphics and the ability to replace any figure with anything you like, Marathon slaughters the miniscule competion with ease. Here in this page I have provided Physics models ("plug-ins" let you modify almost any parameter in the game), cheat programs and demos.

Infinity Game Winp is available in both PPC and 68k versions