DRM-free marketplace GOG.com is holding a "battle of the games" as their 2012 Summer Promo, offering a daily vote to decide which of two games will receive a larger discount when it goes on sale the following day. This begins with a faceoff between Myst: Masterpiece Edition and The 7th Guest, with the winner (Myst is currently holding a healthy lead) to be sold at tomorrow at a 60% discount and the runner-up to be offered for 40% off. This will run over the course of the next 17 games, as they pit a total of 34 games against each other.