Aliens...
	Arena challenges...
	Cheat Codes...

Meet the following requirements to unlock new Aliens.

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

Complete the indicated task to unlock the corresponding challenge.

Arena challenge	How to unlock
Attrition	Collect the Arena Token in Level 2: Mess Hall Mashup.
Big Hits	Collect the Arena Token in Level 4: Undertown and Beyond.
Magnet	Collect the Arena Token in Level 1: Stow Away.
Malfunction	Collect the Arena Token in Level 5: Core of the Problem.
No Time for Heath	Collect the Arena Token in Level 3: Welcome to Erf.
Sale on Turrets	Collect the Arena Token in Level 6: No Time for Sightseeing.

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.