So searching across the inter webs I came across another code that has been deciphered by the Halo community. It’s free 20k XP for Halo 4. It also appears to have no pre-requirements to meet before entering the code.

So take the code enter it here and enjoy your free 20k XP

This isn’t the first code so click here to find the others than have been deciphered by the community. 

The requirements for them are listed in their section headings. Enter the codes from left to right. Enjoy! 🙂