The game has all the weapons from "Doom" and "Doom 2". It also has the Heavy Assault Rifle, which was based on the Assault Rifle in Doom 3. There is also a completely new weapon, the Gauss Cannon. The Chainsaw now has fuel limits, unlike the other Doom games, but it can kill most enemies in one hit, and it also gives the player more ammo pick-ups when he or she is low on ammo. The BFG-9000 also has its own ammo, which can kill every non-boss enemy you can see on-screen. Six weapons have two different mods that can be switched in battle. For example, the Shotgun has both Burst Shot and Grenade Launcher mods.