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GOG has a Mutator Promo running. Buy 3 games for up ato 85% off and then you will unlock 3 mystery mutator games that are $2 each. Promo lasts for 6 days.
The mystery mutator games are chosen at random from the GOG catalog.
Games on sale for the promo are:
American McGee’s Grimm $2.49
Broken Age Season Pass $12.49
Cannon Fodder $1.19
Celtic Kings: Rage of War $1.49
Dracula Trilogy $2
Eador. Masters of the Broken World – Allied Forces $2
Eador. Masters of the Broken World $4
Enclave $1.49
Eschalon: Book III $3
Geneforge Saga $3.74
Hind $1.49
Leisure Suit Larry: Love for Sail! $1.49
Long Live the Queen $2
OlliOlli $6.49
Outlast $5
Outlast: Whistleblower $2.24
Race Driver: GRID $3
Robin Hood: The Legend of Sherwood $2
Silent Service 1+2 $1.49
Soulbringer $1.49
Sword of the Stars: The Pit Gold Edition – The Pilgrim $1
Sword of the Stars: The Pit Gold Edition $3
The Book of Unwritten Tales $3
The Book Of Unwritten Tales: The Critter Chronicles $3
The Night of the Rabbit $4
The Whispered World: Special Edition $4
Theme Hospital $1.49
Thief 2: The Metal Age $2.49
Thief 3: Deadly Shadows $2.49
Thief Gold $2.49
Total Overdose: A Gunslinger’s Tale in Mexico $1.49
Two Worlds $2
Two Worlds 2: Epic Edition $3
Uru: Complete Chronicles $2
Wing Commander 3 Heart of the Tiger $1.49