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GOG has Dragonsphere Free until 12/31. At that point the regular price for the game will go to $5.99.
Duke Nukem titles are on sale for 75-90% off until 12/31. At that point the Duke titles will be removed from their catalog.
Buy all titles for 90% off otherwise it’s 75% off each.
Duke Nukem 3D Atomic Edition $0.59 / $1.49
Duke Nukem 1+2 $0.59 / $1.49
Duke Nukem: Manhattan Project $0.59 / $1.49
Balls of Steel $0.59 / $1.49