Dentists Hate This Halo 4 Promotion
Microsoft announced a new Halo 4 promotion with Doritos and Mountain Dew where players can redeem codes found on specially marked products to earn double XP in War Games multiplayer mode.
Codes can start being redeemed on October 15. There's also a number of prizes available, including a limited edition Halo 4 Xbox 360. Head over to the official contest page for more details on this promotion.
Halo 4 launches worldwide on November 6.