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Unlock Concept Movie:
Beat story mode to unlock this feature.
Unlock General Corrosive for Multiplayer:
To unlock General Corrosive for multiplayer, collect all of the speed chips in the game.
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.