Microsoft has revealed the top 20 most popular games played on the Xbox 360 in 2011 based on numbers of unique users logged into Xbox LIVE (Silver and Gold members). Note that this gives a different result to the total playtime for a particular game, which has not been disclosed here. Unsurprisingly, the Call of Duty series dominates the chart, but what is sure to irk CoD detractors, but make fans very happy, is that a massive five of those positions are taken up by CoD - that's 25% of the rankings. Even CoD4: Modern Warfare which was released way back in 2007 sits at a very respectable number 14. However, top games Battlefield 3 and Skyrim did very well nonetheless, sitting at five and six respectively, with only Halo beating them at number 4. Can you guess which CoD game hit the top spot before looking at the chart?

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The newest addition to the Call of Duty (COD) franchise, Call of Duty: World at War, has outsold the first week sales of Call of Duty 4 by greater than 200%. This title is all set to become Christmas number one, and has gone to the top of the All Formats charts in the UK, according to data from GfK Chart-Track.

The figures are rough, and GfK Chart-Track didn't provide a per-platform breakdown, to provide how the game is being received by different platforms. COD: World at War added more console platform support, with Sony PS2 and Nintendo DS over its predecessor.