The listing, Halo 4 Double XP code from a 24 pack has ended.
Mtn Dew®/Halo® 4 "Unlock & Load With Double XP" is an online code-based sweepstakes promotion. Consumers enter a code found on specially-marked Mountain Dew® and DORITOS® products to bank Double XP matches and to enter for a chance to win prizes. To play, go to www.dewxp.com and follow the online directions to sign-in or register. Each time an eligible individual logs onto the Website using their e-mail address and enters a Code, the Participant will automatically receive the amount of Double XP matches associated with their Code, and a sweepstakes entry.