The Mule Kick is one of many “Perk-a-Cola’s” in the Call of Duty: Black Ops Zombie game mode. It costs 4000 points and give the player access to a third weapon slot! Meaning players can carry three weapons. A very useful perk.
It has been made available to all Zombie maps as of October 11th on the PC. It was made available to PS3 and Xbox 360 Zombie maps on September 27th.
Enjoy using Mule Kick!
P.s. Make sure you are connected to the internet since you’ll need to update the game for this change to be applied.