The Hellfire is a Contract Killer Zombies weapon that resembles an M134 Minigun and holds 300 rounds. With one of the highest damage stats in the game, it is a huge weapon which can be used to take down hordes of zombies easily. It costs 995 Gold to purchase. As with miniguns, it does not start firing straight away; a short spin-up time period occurs before the actual firing starts when the fire button is held down.
The Hellfire Limited is an upgraded version of the Hellfire, this time sporting a gold finish, has double the capacity, and is more powerful. It also costs 1,000 credits more. Even though the description claims that the deal will end soon, it does not seem likely to disappear from the game.
Any gun with a "*" means it cannot be used by the player in-game. Any gun with a "**" means it got cut from the final game. Any gun with a "***" means it did not appear in the game, albeit only mentioned.