Pack-a-punch is a special type of perk in all of the call of duty zombie modes. It allows the player to upgrade a weapon for a cost of 5000 points. It is mainly used by going through the teleporter. Also, in kino der toten, if you use the teleporter to get to the pack-a-punch weapon room then the zombie cannot reach you becaues you are in the projector room of the theater. In most pack-a-punch rooms there is a time limit so if you do not have enough points then you will have to wait for the teleporter to cool down.