Unlock All Modes:
During game-play enter X, X, X, A, Left, Right, Left, Right, X, X, X, A, Left, Right, Left, Right.


Completion Bonuses:
To unlock the following difficulty settings complete the game on certain modes.

Unlock 'Hard Boiled' setting:
Complete 'Detective' mode.

Unlock 'Dead Man Walking' setting:
Complete 'Detective' mode.

Unlock 'New York Minute' setting:
Complete 'Detective' mode.

Unlock D.O.A. Setting:
Complete on 'Hard Boiled' mode.

Complete the game under the "Detective" difficulty setting to unlock the Hard Boiled, New York Minute, and Dead Man Walking modes. Complete the game under the "Hard-Boiled" difficulty setting to unlock Dead On Arrival mode.