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The GOG Classic Gem (Stacking) Promo for the week is on the Gothic Series. This is a stacking promo, which means the discount goes up the more games you purchase.
The minimum discount is 50% off one game. The max discount is 75% off if you buy all four games.
Gothic = $2.49
Gothic 2 Gold Edition = $2.49
Gothic 3 = $2.49Gothic 3: Forsaken Gods Enhanced Edition = $2.49