Linux runs every Unreal, Doom and Quake made (maybe with an exception of doom 3, not sure), also games like Rune(never played it, but my friend is a fan) as well as any other imaginable game, from emulations (ps an atari emulator has recently come out for linux) to 3d billiards to simutrans(like simcity), glest 3d strategy that looks great, and all your windows games under cedega(HL2, WoW, Knights of the old republic, Battlefield 1942, Max Payne 2, GTA Vice City, Battlefield: Vietnam, WarCraft III, Diablo II, Half-Life, City of Heroes, Star Wars Galaxies, EverQuest, Jedi Knight 2)
enjoy

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Microsoft, the leader in using innovative tactics to promote irksome experience, coupled with antiquated technology that's held together by a pyramid of makeshift afterthoughts.
Apple, the leader in using irksome tactics to promote innovative experience, coupled with an antiquated core that's enhanced by state-of-the-art afterthoughts.
Linux, the leader in not using any tactics to promote user-defined experience, coupled with state-of-the-art core enhanced by innovative afterthoughts.
