what games can I play?

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http://forums.opensuse.org – what games can I play on linux? I've heard you can't play the same games on linux that you can on windows, is this correct? if not, which ones can't I play? Can I play all my zsnes rom games on linux? What about demos like call of duty world at war, and left 4 dead and battlefield bad company? Thanks To be honest, I'm not even too familiar with windows games, since I know a lot of windows games aren't the same as console games, and vice versa (Distributions)