Didn't interest me.
GOG's special "Mutator Promo," in which you could have purchased three mystery games for $2 each after purchasing three qualifying games has ended.
Those "mystery games" wasn't a total mystery, because GOG hid a clue (a release date) for each of their mystery games in the code of their checkout page.
Unfortunately for me, I never received an opportunity to score a mystery game that interest me.
The mystery games that I could have acquired after making a qualifying purchase was Capitalism Plus (normally $5.99), Darwinia (normally $9.99) and Hotline Miami (normally $9.99).
I was really hoping to score Shadow Warrior (2013) as one of my mystery games, because that $39.99 game is on my "to buy" list.
I purchased Outlast: Whistleblower ($2.24), Shadow Warrior Classic Complete ($1.49) and Thief II: The Metal Age ($2.49) during that interesting sale.
Question: Was you lucky during GOG's "Mutator Promo?"
Image credit: GOG.com