This weekend we're offering you a flat 40% discount on all Zork games that are available in GOG's catalogue - and that includes the first, text-based only games as well as graphical adventure titles Return to Zork, Zork Nemesis: The Forbidden Lands and Zork: Grand Inquisitor. You receive the 40% discount no matter how many games you buy, and that means it's only $3.59 a piece, so hurry up because the offer ends on Monday, August 18 at 11:59 p.m. EDT.