Earning double XP in Call of Duty World at War and getting to play Nazi zombie killing co-op has never been easier to achieve then this weekend thanks to Treyarch's philanthropist ways. From now through weekend's end, all World at War players will earn twice the XP AND have access to the Nazi Zombies co-op playlist. No unlocking required! Nazi zombie killing and double the XP? We must be dreamin'.

[Thanks, Rooster286]

This article was originally published on Joystiq.