Big Heads
During gameplay HOLD BACK and press A, X, B, Y, A . A message will confirm correct code entry.
Chicken Heads
During gameplay HOLD BACK and press X, X, Y, A, B . A message will confirm correct code entry.
Flat Characters
During gameplay HOLD BACK and press B, A, X, Y, A . A message will confirm correct code entry.
Helium Mode
During gameplay HOLD BACK and press X, A, Y, B, X . A message will confirm correct code entry.
Hit A High Note
During gameplay HOLD BACK and press X, A, Y, B, X . A message will confirm correct code entry.
Slow Motion
During gameplay HOLD BACK and press Y, Y, B, X, A . A message will confirm correct code entry.
New Character
Finish the game once and unlock a new character has infinite rocket ammo.
Secret people
To unlock people with better ratings, beat the X, or bonus objective in each campaign level.
Medals
Purple Heart: Get wounded or killed in action.
Bronze Star: Get 15 kills
Silver Star: Get 20 kills
Distinguished Service Cross: Get 25 kills
Congressional Medal Of Honor: Get 30 kills
