Retro gaming store Good Old Games celebrates its one year anniversary and to reward its faithful customers and attract new ones, they've got a fetching discount up their sleeve.

GOG.com's Lukasz Kukawski told Eurogamer that starting on September 2nd, gamers will be able to buy one Interplay game and get another for free. The promotion will run until Monday, September 7th.

Interplay was one of the first two publishers to bring their back catalog to GOG (the other being Codemasters). There's currently 33 Interplay titles available through the service, including the Fallout, Earthworm Jim and Freespace series. All games on GOG are DRM-free and compatible with Vista/XP.