Unlock & Load Double XP

Unlock & Load Double XP, also known as DewXP or DoritosXP, was a Halo 4 promotion which allowed players to earn double XP. People could buy Mountain Dew and Doritos products marked with Halo 4 images that had a code on them. The codes could be redeemed at the promotional site, http://dewxp.com/, for a specific number of matches to earn double XP. The promotion also marked the return of Halo-themed Game Fuel.

Rules
Double XP matches can be applied to any Gamertag. There is a limit of 200 matches per Gamertag, and 750 codes per DewXP account. Matches can also be gifted to other users. Each code also gives the user one sweepstakes entry.

Mountain Dew

 * 20oz bottle (all flavors) - 3 matches
 * 12 pack (original, diet, Game Fuel) - 6 matches
 * 24 pack (original, diet) - 12 matches (Walmart only)

Doritos

 * 2.75oz - 3 matches
 * 3.875oz - 3 matches
 * 11.5 oz - 12 matches (Walmart only)

Other

 * Entering a Mountain Dew and Doritos code at the same time - 2 matches
 * Free Code Request

Sweepstakes Prizes

 * Halo 4 Wireless Controller - 105 available
 * Halo 4 Xbox 360 Console - 20 available
 * Halo 4 Limited Edition - 100 available
 * 12 Month Xbox Live Gold Membership - 75 available
 * 14 '' Jada Warthog Die Cast - 50 available
 * 7 '' Jada Warthog Die Cast With Figures - 52 available
 * 6 '' McFarlane Halo 4 Figures - 400 available
 * Halo 4 Hoodie - 200 available
 * Halo 4 Avatar T-Shirt - 1000 available
 * ACME Gallery Wrapped Canvas - 50 available

Trivia
Unlock & Load Double XP is not the first DewXP promotion. The promotion was available in 2011, known as Rank Up Your Game, which earned double XP for Call of Duty: Modern Warfare 3. The promotions for each game are by similar, though Halo 4 tracks double XP by matches, whereas Modern Warfare 3 had time frames.