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Man, are you out of touch or what? There's been a Steam client out for Linux for quote some time now and it runs my Steam games quite nicely. Serious Sam 3 BFE and my other games run as good on Linux as they do on my Windows machine. There's also a Steam client for OSX but I haven't played with it. No, you don't have to buy native Linux or OSX versions of the games. You buy once, then play on any platform that runs Steam.