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Playstation - Area 51 cheats

Rebel Kronn Hunter mode
Shoot the first 3 S.T.A.A.R. team members at the starting of 
the game to enter Rebel Kronn Hunter mode.

Worst ending:
Let the Mothership escape without shoting any panels. 

Best ending:
Shoot off all the panels on the Mothership. 

Start with Shotgun:
Push Triangle, Square, Triangle, Left, R1 at the pause screen