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One-third of Xbox One owners have purchased a copy of launch title Forza Motorsport 5, Microsoft announced today on the Xbox Wire. With over 3 million Xbox Ones sold by the end of 2013, that means Turn 10's racing game has shifted more than 1 million copies to date.

Forza 5 becomes the second Microsoft-published Xbox One title to reach the 1 million mark, following Dead Rising 3, though that game has shipped, not sold, 1 million copies. One million sales for Forza 5 means the game is now the "best-selling racing game by console attach over the past decade," based on worldwide sales data as of February 2014.

This is one of the first instances we can recall of sales being measured by attach rate. In short, Microsoft claims that the percentage of people who own Forza 5 is higher than for any other racing game based on the number of consoles sold. The data point is somewhat odd because the Xbox One install base will continue to grow, which means the attach rate will conceivably fall.

Others stats in the link.