Unlock 100 Challenge Mode.

Complete all nine Outdoor Shooting Range challenges.

Night Vision Mode.

Enter the following at the Mode Select Screen Hold R and press Start, Start, Start, Start, Start

Pro Mode.

Enter the following at the Mode Select Screen Hold R and press Start, Start, Start, Start

Pro Night Vision Mode.

Enter the following at the Mode Select Screen Hold R and press Start, Start, Start, Start, Start, Start

Cupid Mode.

Enter the following at the Mode Select Screen Left, Right, Right, X, Y. A sound effect will confirm correct code entry.

Hidden Mode.

Enter the following at the Mode Select Screen Right, Down, Right, X, Up, X, X, Y, Down, Right, Down, Right, X, Y

Night Mode.

Enter the following at the Mode Select Screen Up, Right, Down, Left, Up, X, Y

Mirror Mode.

Enter the following at the Mode Select Screen Left, Left, Right, X, Down, Down, Up, Y, Up, Right, Down, Up, Left, Down, X

No Enemy Targeting Mode.

Enter the following at the Mode Select Screen Right, Right, Right, Right, Left, Down, Up, Right

Super-Fast Mode.

Enter the following at the Mode Select Screen Down, Y, Up, X, Y, Down, Right, Down, Right, X, Y

No Crosshair Mode.

Enter the following at the Mode Select Screen Right, Right, Right, X A sound effect will confirm correct code entry.

No-Scope Mode.

Enter the following at the Mode Select Screen Right, Down, Right, X, Right, Down, Right, X

1st Person View.

Enter the following at the Mode Select Screen Up, Up, Up, Up, Down, Down, Down, Down

Swap Half Life For 5 Seconds.

Pause the game and enter Up, Up, Down, Down, Left, Right, Left, Right, A, B

Swap 5 Seconds For Half Life.

Pause the game and enter B, A, Right, Left, Right, Left, Down, Down, Up, Up