Techland and Deep Silver's zombie shooterfor Xbox 360, PlayStation 3 and PC has shipped more than 1 million units in North America in its first week on sale.Publisher Deep Silver noted that the game has also topped the software charts in various regions worldwide, including the UK and France, while also topping the sales charts on digital distribution platform Steam.The company revealed that, by the end of the current week, it will have sold 2 million copies of the game to retailers in total.Geoff Mulligan, chief operating officer at Deep Silver, explained, "We're thrilled at the retail receptionhas achieved in its first few days.""The critical 'first week' of game sales has been an enormous sales success for Deep Silver. We're working quickly with our distribution partner in North America, Square Enix, to restock shelves as quickly as we can."was released earlier this month, and received generally good reviews from the press.However, when the game was first released in North America, Deep Silver accidentally released an "incorrect version" of the game on Steam, which included game freezes and crashes, graphical issues, and odd in-game behavior such as the ability to walk through walls.