The key is actually Battle vs Chess, from Bundlestars. According to the discussions right here on SG, this is the same game (worldwide version vs US version). It sounds like it also has some very intrusive DRM.
So please, PLEASE, only enter if you know what you are doing, what game you are getting, and having done appropriate research.
Enjoy!
You can enter even if you already own the game, so please check your winner (in case he didn't realise he already owns it).
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http://store.steampowered.com/app/211050/ this ?
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