Microsoft has announced that the conclusion to the trilogy has broken an impressive landmark within its first week of release.

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Gears of War 3 has sold 3 million copies worldwide taking the series through the 1 billion USD mark since the first game was released in 2006.

Microsoft's Phil Spencer said: "Gears of War was the first killer app for 360, and the series has continued to contribute directly to the overall success of the platform ever since. kicked off the biggest period in Xbox history, setting the standard for the kind of amazing, action-packed experiences gamers should expect on this year."

Epic's latest release has already been hailed as the biggest launch of 2011 so far and has scored exceptionally highly with the critics. We gave it a healthy 96 percent when we reviewed it.

By Ewan Aiton