Halo fans hoping to level up their soldiers in Halo 4 can pick up Mountain Dew and Doritos products to earn double experience points.

Beginning October 15, players who purchase Mountain Dew’s special Game Fuel soft drink and specially marked Doritos products can begin entering codes through the promotion’s website. Load up on Double XP before the game launches beginning November 6, 2012.

Halo 4 fans can also get their hands on the new app that uses location-based augmented reality. The game app will work on both the iPad and the iPhone, and is designed to help promote Halo 4, Mountain Dew, and 7-Eleven stores.

The app is available worldwide, but is focused on the U.S. and Canada and is designed to allow players to fight to be the King of the Hill at their local 7-Eleven store.

The app allows players to win all sorts of in game awards, including digital Halo 4 gear such as Double XP and an exclusive Custom Locus Helmet for U.S. players. Players in Canada can win a custom Ghost Prop Avatar. The game app requires players to scan their favorite Halo 4 themed Mountain Dew and Doritos products to get supplies in games to keep the battle going.