Unlockable List:
Beat the game twice: Level Select 
Get two head shots in a row: Team Power 
For Level Skip at the Story Mode select screen press: L1, SQUARE, R1, R1, R2, 
SQUARE, L1, R1, R2 
UP, LEFT, DOWN, LEFT, DOWN, UP, UP, LEFT: Big heads 
L1, LEFT, L1, LEFT, R1, RIGHT, R1, RIGHT: Disco Mode 
UP, UP, UP, UP, UP, UP, DOWN, RIGHT, UP: Low Gravity 
Two 100% head shot statuses in a row: Custom 
All team members must beat an episode with 100%: Defeat Leader 
In Single Player Mode upgrade a weapon with a character and do not miss during 
the level: Humans and Creatures 
 
Hint: The Boat level:
When you have to get the boat downstream, kill off the two Sintrek, the Grenadak, 
and the other monster. Do not worry if one of your characters dies; just take out 
the monsters. When this is done, destroy the two stones in the river, then the 
bridge (completely obliterate it), then do the same for the water mill. Then, 
destroy the dock. Do not be in the boat when you do this. After the dock is 
destroyed, jump into the boat, release the controller, and an intermission 
sequence will start.

The Stranger level:
Do not worry if one of your characters dies; they will come back to life after you 
finish the episode. However, to make sure you have a nearly 100% chance of 
winning, get on top of the roofs when no monster is there. Once this is done, you 
can snipe away at your enemies. After you shoot, go all the way back to the 
mountain that touches the roof, but do not go down. Shield, because the monsters 
will shoot your building. If you are all the way back, you will not get hurt. Do not 
worry -- the building cannot crash and you will be fine doing this.