Upgrade Codes
Select the 'Promotions' option at the 'Extras' menu and enter one of the following codes by selecting the indicated aliens to unlock the corresponding upgrade.
Gravattack Upgrade:
Enter Feedback, Fourarms, Diamondhead, Bloxx as a code.
Wildvine Upgrade:
Enter Gravattack, Eye Guy, Arctiguana, Wildmutt as a code.
XLR8 Upgrade:
Enter Shocksquatch, Gravattack, Arctiguana, Diamondhead as a code.
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