The promotional union between Halo 4 and PepsiCo, the latter being proprietor of the vast Doritos and Mountain Dew empires, is drawing ire from the game's community today - not for the delicious blend of accelerated promotion and bold spices, but because it's not working. Players are running into issues getting their bonus experience points.

Halo 4 owners must register on a promotional website before applying their codes to the game, but even those who have done so are claiming their double XP rewards as missing in action. Microsoft has yet to respond to the Halo Waypoint forums in which the complaints originate.

We've contacted Microsoft to see if this is an acknowledged issue and, if so, what steps are being taken to rectify it. In the meantime, it may behoove you to hold back on the double XP and level up like the common people.

[Thanks, Graeme.]