PSBlog: In Dead Nation’s action-packed levels, it’s crucial to collect as much cash as possible from the undead hordes and trunks of vehicles. Once you find a Weapon Shop, you’ll be able to cash in your loot and purchase more ammo and, most importantly, weapon upgrades. Increasing the power and firing rate for your default Rifle can be the difference between life and (un)death, especially since it’s your designated fallback weapon and the only gun with unlimited ammo. The SMG and Shotgun also benefit enormously from power and firing rate, helping you annihilate dozens of ghouls at a time. You can also upgrade ammo carrying capacity and clip size for most weapons, while power weapons such as the Blade Cannon feature special weapon-specific upgrades.