Silent Scope cheats and cheat codes for Playstation 2

Go to the mode selection screen and enter the following cheats:
The guns hot will confirm, if the codes are accepted,

Hidden mode
Press Right, Down, Right, Square, Up, Square, Square, Triangle, 
Down, Right, Down, Right, Square, Triangle.

Disable crosshair
Press Right, Right, Right, Square.

Disable scope
Press Right, Down, Right, Square, Right, Down, Right, Square.

Disable enemy cursor
Press Right, Right, Right, Right, Left, Down, Up, Right.

Mirrored levels
Press Left, Left, Right, Square, Down, Down, Up, Triangle, Up, 
Right, Down, Up, Left, Down, Square.

First person view
Press Up, Up, Up, Up, Down, Down, Down, Down.

Turbo mode
Press Down, Triangle, Up, Square, Triangle, Down, Right, Down, 
Right, Square, Triangle.

Love mode
Press Left, Right, Right, Square, Triangle.

Night mode
Press Up, Right, Down, Left, Up, Square, Triangle.

Exchange a half of life for five seconds
Play in arcade mode. Pause the game play and press 
Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.

Exchange five seconds for half of life
Play in arcade mode. Pause the game play and press Circle, X, Right, 
Left,Right, Left, Down, Down, Up, Up.

Unlock 100 challenge mode
Finish all 9 outdoor shooting range challenges

Extra options
Finish the game on any difficulty mode

Unlock unlimited credits and +30 in the time limit section. 
Finish the game at least 3 times on any difficulty mode