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Playstation 2 - Operation WinBack cheats

This game other title: Operation WinBack.

Go to the "Press Start" screen, after quickly press the following 
button combinations. If the codes are accepted, you will hear a 
gun shot. These codes must be type before the demonstration 
mode startings.  

Trial mode:
Up, Down, Down, Right, Right, Right, Left, Left, Left, Left, 
then hold Triangle and press Start

Maximum power mode:
L1, R2, L2, R2, L2, Triangle, Circle, Triangle, Circle, 
after hold L1 and press Start

Unlock Bosses and engineers, army characters in multi-player characters:
Up, Down, Down, Right, Right, Right, Left, Left, Left, Left, 
then hold Circle and press Start

Sudden death:
L2, R2, L2, R2, Circle, Triangle, Circle, Triangle, 
after hold L1 and press Start

Unlock Maximum power, sudden death, trial modes
Finish the game in hard mode 

Unlock all multi-player characters
Finish the game on the easy and normal mode