Unlockable | How to unlock
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Aerodactyle | Finish Level 2: Mess Hall Mashup.
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Big Chill | Finish Level 3: Welcome to Erf.
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Bullfrag | Finish Level 2: Mess Hall Mashup.
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Cannonbolt | Finish Level 5: Core of the Problem.
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Gravattack | Finish Level 4: Underground and Beyond.
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Swampfire | Finish Level 1: Stow Away.
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XLR8 | Finish Level 4: Underground and Beyond.
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