At the 'main' menu select the 'Cheats' option and enter one of the following codes without the quotes to enable the corresponding effect:

Unlock Bonus Concept Art:
Enter the code 'LASTCHANCEMARIE' to unlock extra concept art.

Unlock Bonus Music Track:
Enter the code 'JASONBOURNEISDEAD' to unlock an extra music track.

The following hidden features become available by selecting the 'Cheats' option at the 'Main' menu and entering the corresponding codes (without the quotes).

Unlock Bonus Concept Art:
Enter the code 'LASTCHANCEMARIE'.

Unlock Bonus Music Track:
Enter the code 'JASONBOURNEISDEAD'.

A more effective way of fighting hand-to-hand than just button mashing is to do simple three-button combiniations such as X(2), Y or Y, X, Y. Entering these type of combinations gives the enemy less chance to block or counter.

At the 'Main' menu enter the following codes to get these alternate weapons.

Unlock Automatic Shotgun (Replaces the Assualt Shotgun):
Enter the code ALWAYSANOBJECTIVE

Unlock Silenced Machine Gun (Replaces the Normal Machine Gun):
Enter the code WHATTHEYMAKEYOUGIVE