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GOG has a Platformers Weekend Promo going on. Platform games are on sale for up to 75% off.
Spelunky $5
Dust: An Elysian Tail $5
Valdis Story: Abyssal City $5
Unepic $4
Teslagrad $4
Stick it to the Man! $5
Giana Sisters: Twisted Dreams $3.74
Giana Sisters: Rise of the Owlverlord $1.24
Psychonauts $3
Windforge $7.49
Super Puzzle Platformer Deluxe $2
Waking Mars $2.49
Tales From Space: Mutant Blobs Attack $2
A Story About My Uncle $6.49
Ethan: Meteor Hunter $2.49
Duke Nukem 1+2 $2
Duke Nukem: Manhattan Project $2
Hocus Pocus $2
Volgarr the Viking $4
Secret Agent $2
Escape Goat $2
Escape Goat 2 $6.66
Realms of Chaos $2