Activision and Infinity Ward are launching a new initiative to raise money for charity War Child.
Titled Game for Good, it's being organised with the help of GAME and Xbox Live. All you have to do to take part is play Call of Duty: Modern Warfare 2 online during the weekend of 5th - 6th December. During those days Xbox Live Gold membership will be free in a bid to encourage more people to join in.
If more than 600,000 UK users log on War Child will get a donation of £150,000. A further £25,000 will be donated for every 100,000 users after that, up to a maximum of £250,000.
GAME will show support by selling War Child wristbands in stores. To get more information, or to get a "Twibbon" to show your support, check out the Game for Good Facebook page.