The pack-a-punch machine is getting old so I think there should be another machine called HELL-A-PUNCH or KILL-A-BUNCH. The HELL-A-PUNCH will be located behind a door near the pack-a-punch machine. The door is called the HELL DOOR, which costs 10,000 points to open. The HELL-A-PUNCH machine will only upgrade upgraded weapons into something called HELL WEAPONS. The HELL UPGRADE will cost 7,000 points, but will give the player an extremely powerful weapon. The HELL WEAPONS will also come with a negative side effect like giving the player lower health, running speed, or jump height. The negative effect of the HELL WEAPONS will be random so the players won't know what to expect. The HELL WEAPONS will be red and black with zombie blood dripping off of the weapon. Every HELL WEAPONS will have a special ability like the raygun having the ability to lock on to enemies. The HELL-A-PUNCH will also upgrade equipements like claymore, gersh device, and monkey bombs.
I think that the upgraded sniper should shoot out a laser that would go throught every zombie since the snipers are totally useless in most of the zombie maps.
There should also be more mellee weapons in the mystery box. The melee weapons will have a bar called durability, which is like ammo. Every time you hit an enemy, your durability will decrease until you can't use it anymore. There should be a katana or sword that insta kills zombie in the first 15 rounds.
FEEDBACK?
The perk machine should have an upgraded version, which makes your perk pro. You can upgrad a perk by buying the machine a second time. The price of the second purchase will be triple the normal price. The pro perks will give players an extra ability.