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.
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.
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