This weekend we're offering you a flat 50% discount on all Cyan Worlds and Cyan Inc. games that are available in GOG's catalogue - and that includes the whole Myst franchise, Manhole: Masterpiece Edition, and the Myst’s successor Riven. You receive the 50% discount no matter how many games you buy, and that means it's only $3.00 for each of the Myst games, so hurry up because the offer ends on Monday, August 29 at 11:59 p.m. EDT.