Purchase, N.Y.-based PepsiCo brands Mountain Dew and Doritos announced the return of their Double XP promotion as part of the Nov. 6 launch of the Halo 4 video game. Double XP provides fans with unique opportunities to experience the next installment of the gaming saga, the companies say.

Players can get a head start on the game by opening an account at dewxp.com or doritosxp.com where they'll be able to unlock and load future XP matches that can be redeemed to amplify the multi-player experience, accelerate Halo 4 specializations, and reveal ultra-new gear and weapons. In addition to being able to customize armor permutations, for the first time in Halo history, players will be able to preselect their arsenals before entering the gaming landscape.

Once an account is created on the DewXP or DoritosXP site, fans can purchase specially marked packages of Mountain Dew and Doritos products and enter the on-pack codes online starting Oct. 15 to load XP matches, which can be redeemed for use once Halo 4 launches.

Fans can unlock even more XP matches by purchasing Mountain Dew and Doritos products together or purchasing specially marked 24-packs of Mountain Dew and 10.5- or 11.5-ounce bags of Doritos chips at Walmart. Plus, Halo 4 games sold at Walmart will include an insert with a unique code that can be used to multiply XP matches when paired with the on-package Mountain Dew and Doritos product codes.

Beginning in late October, fans also can unlock Double XP matches, Halo 4 game content and badges at any 7-Eleven location nationwide with an exclusive King of the Hill mobile app and the purchase of Mountain Dew and Doritos products.

"Gaming is in the DNA of Dew Nation," said Brett O'Brien, vice president of marketing for Mountain Dew, in a statement. "We know gamers bring an awesome amount of passion to Dew, and we're excited to help them level-up their Halo experience like never before thanks to Double XP."

"The Doritos brand is all about fueling bold experiences — look no further than our legacy in gaming," said Ram Krishnan, vice president of marketing for Frito-Lay North America, in a statement. "From letting our fans have the opportunity to work alongside Microsoft developers to create their own epic video games to partnering with the biggest games of the year, like Halo 4, Doritos knows its consumers live for the game, and we're all about taking it to the next level."

For complete details, visit dewxp.com or doritosxp.com.