VGChartz follows their preorder figures for StarCraft II: Wings of Liberty with an estimate of the first-day sales of the real-time strategy sequel. They think the game sold as many as 1.8 million units, a pretty impressive figure, and all the more so considering it does not account for Asian territories. They say: "Breaking down the 1.8 million sales in the Americas and Europe, VGChartz estimates that around 31% or 570,000 units were sold digitally via Battle.net (obtained via a study of order numbers during the first day of sale) with the remainder coming from physical retail sales and 57% of total sales coming from the Americas with the remainder from Europe." Thanks joao. In other SC2 news, Big Download has word that chat rooms will be included in an upcoming patch, and Joystiq has word on the RTS sequel's inclusion of a Lost Viking arcade mini-game.