Sales
Based on sales data from Amazon.com, Portal 2 was the best-selling game in the United States in the first week of its release, but was overtaken by Mortal Kombat in its second week. According to NPD Group, Portal 2 was the second-best selling game in the U.S. in April 2011, at 637,000 copies, and the fourth-best selling in May. However, NPD does not include sales on Valve's Steam platform. Portal 2 was the best selling game in the U.K. in the first week of its release, the first number-one for a Valve game. It retained the top spot during its second week.
Portal 2 was released a few days before the PlayStation Network outage. Gamasutra analyst Matt Matthews said that, based on NPD Group data, the outage "did not seriously affect retail sales of software", but some developers did report drops in sales. ShopToNews analyst Joe Anderson expected that the effect of the outage on UK sales of Portal 2 would be mild. On June 22, Newell announced that Portal 2 had sold 3 million copies. As of July 2011, Electronic Arts stated that more than 2 million copies of Portal 2 have been sold by retailers worldwide. In an August 2011 interview, Newell stated that "Portal 2 did better on the PC than it did on the consoles". Upon release of the Perpetual Testing Initiative in May 2012, Newell stated that Portal 2 had shipped more than 4 million units, with the personal computer versions outselling the console versions. Overall, Portal and Portal 2 had together shipped more than 8 million units.
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