Select "Promotions" at the "Extras" menu, then enter one of the following codes.
Upgraded Gravattac
Enter Feedback, Fourarms, Diamondhead, Bloxx as a code.
Upgraded Wildvine
Enter Gravattack, Eye Guy, Arctiguana, Wildmutt as a code.
Upgraded XLR8
Enter Shocksquatch, Gravattack, Arctiguana, Diamondhead as a code.
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