Halo: Combat Evolved

Considered as one of the greatest FPS's ever, Halo: Combat Evolved works on PPC! Play through the award winning campaign or blast people to bits on online Multi-Player!

Save the universe from the Covenant, the Flood, and the destructive blast of the Halo. The game runs fairly nice at highest settings with a few frame rate drops in larger levels.

You can buy the game from MacSoft's website: MacSoft

If that's not your style, there are torrents out there...