This weekend Activision and Infinity Ward are launching the 'Game for Good' event, encouraging gamers to play Modern Warfare 2 to raise money for the War Child charity.
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The initiative is being organised with the help of GAME and Xbox Live and all you have to do to take part is play Call of Duty: Modern Warfare 2 online on the 5th and 6th of December (that's this weekend).
If more than 600,000 UK users get their Modern Warfare on, the War Child charity will receive a donation of £150,000, says Activision. An extra £25,000 will be donated for every 100,000 users after that, up to a maximum total of £250,000.
[Update] Microsoft has clarified its support for the weekend, saying that Xbox Live Gold will not be free, but Silver members can take part by playing Special Ops mode.