Posted July 10, 2014
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Unfortunately, from what I can tell it isn't any free game (that would be a little too good to be true), but according to this page, the options include:
Sacred Gold
Gothic 2 Gold Edition
Empire Earth: Gold Edition
Divine Divinity
Dungeon Keeper Gold™
Darwinia
Tiny and Big: Grandpa's Leftovers
Puddle
Defender's Quest
Megabyte Punch
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Paying $6 could potentially get you a $6 GOG game.