SteamDB detects the DLCs you already own, the "Steam learning" games too.
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ESGST finds some of these with it's sync and stops you from entering ones it finds, but I also use Steam Web Integration to double-check things I enter.
I really hate having to ask for re-rolls, so I try to prevent it as best I can.
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Dolng a sync detects only a few (not even counting DLC's) and many times i spend points here on SG when i enter a giveaway for a game i have but i dont know i have.
hope i made myself clear and if something like that exists would save the trouble to go on steam and check every game to see if i have it on my library or not
thanks in advance
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