Players start with a pistol but eventually upgrade to assault rifles, Wonder Weapons (sci-fi tools of destruction), and the iconic Pack-a-Punch machine, which supercharges firearms.
The objective is simple but brutal: Players (solo or up to four) are dropped into a map and must fight off increasingly difficult waves of undead.
The lore, often called the , is a sprawling multiverse epic involving Element 115, ancient aliens (the Apothicons), and a core cast of four characters: Dempsey, Nikolai, Takeo, and Richtofen. What started as a WWII experiment gone wrong evolved into a cosmic battle for the soul of reality. 4. Evolution of the Series