GOG is currently one of the largest online digital market stores. It specializes in selling Indie games and old titles, and has a catalog of nearly 2000 games. Unlike other online digital games stores, GOG has its own delivery and download system, allowing you to store in your library every game you buy, like Steam. The purchase of any products from this store will be stored in your account or in your personal library, so the delivery a cd key by email is not necessary. One of the advantages over other stores, is that it is possible to return games within 30 days of purchase if this does not convince us. The payment methods are best known as Paypal or by credit card.