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I mostly buy my games on Steam so i'm not really familiar with the GOG library all that much, are there any good old FPS games which aren't on Steam?
I don't know, but this list might be helpful to you

https://www.gog.com/mix/games_not_available_on_steam?ccr=y
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LegendarySandwich: I mostly buy my games on Steam so i'm not really familiar with the GOG library all that much, are there any good old FPS games which aren't on Steam?
I would recommend Outlaws.
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Asbeau: I don't know, but this list might be helpful to you

https://www.gog.com/mix/games_not_available_on_steam?ccr=y
Cool thanks!