During gameplay press L1, Left, L1, Left, R1, Right, R1, Right.
Unlock level Skip
During gameplay press L1, Square, R1, r1, R2, Square, L1, R1, R2.
Unlock Low Gravity
During gameplay press Up, Up, Up, Up, Up, Up, Down, Right, Up
Unlock Big Heads
During gameplay press Up, Left, Down, Left, Down, Up, Up, Left.
Unlock Team Power Option
Make 2 head shots in a row and this will be unlocked in the battle mode menu
Unlock Level Select Option
Finish the game 2 times
Unlock Custom Option
Make 100% hit head shot status and this will be unlocked in the battle mode menu
Unlock Defeat Leader Option
Make all team leaders finish a episode with 100% health and this will be unlocked in the battle mode menu
Unlock Humans & Creatures Option
Make a member of your team get their weapon fully upgraded while using single player mode OR in single player mode don't let ANY of the team members miss during an episode and this will be unlocked in the battle mode menu

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