Get Concept Movie
Beat story mode to unlock this feature.
General Corrosive for Multiplayer
To unlock General Corrosive for multiplayer, collect all of the speed chips in the game.
Tips on fighting the Zombiebot King
In order to beat the Zombiebot King just wear him down using rockets until he pauses doesn't move. Toss a grenade coring charge into its mouth. On Normal, it takes five grenades to kill him and after the 3rd and 4th grenades there are regular zombiebots that swarm the arena.