Silent Scope Codes -

Professional Challenge mode:
Hold R at the mode selection screen and highlight "Training" or "Arcade". Keep R held and press Start(4). The sound of a gun will confirm correct code entry. The aiming ring and enemy markers will be disabled in this mode.

Night Vision Challenge mode:
Hold R at the mode selection screen and highlight "Training" or "Arcade". Keep R held and press Start(5). The sound of a gun will confirm correct code entry. The game will begin at night and require the Night Vision scope.

Professional Night Vision Challenge mode:
Hold R at the mode selection screen and highlight "Training" or "Arcade". Keep R held and press Start(6). The sound of a gun will confirm correct code entry. The game will begin at night, with no aiming ring or enemy markers.

Mirrored levels:
Press Left(2), Right, X, Down(2), Up, Y, Up, Right, Down, Up, Left, Down, X at the mode selection screen. The sound of a gun will confirm correct code entry.

First person view:
Press Up(4), Down(4) at the mode selection screen. The sound of a gun will confirm correct code entry.

Disable aiming ring:
Press Right(3), X at the mode selection screen. The sound of a gun will confirm correct code entry.

Disable enemy markers:
Press Right(4), Left, Down, Up, Right at the mode selection screen. The sound of a gun will confirm correct code entry.

Disable scope:
Press Right, Down, Right, X, Right, Down, Right, X at the mode selection screen. The sound of a gun will confirm correct code entry.

Love mode:
Press Left, Right, Right, X, Y at the mode selection screen. The sound of a gun will confirm correct code entry.

Turbo mode:
Press Down, Y, Up, X, Y, Down, Right, Down, Right, X, Y at the mode selection screen. The sound of a gun will confirm correct code entry.

Night mode:
Press Up, Right, Down, Left, Up, X, Y at the mode selection screen. The sound of a gun will confirm correct code entry.

Hidden mode:
Press Right, Down, Right, X, Up, X(2), Y, Down, Right, Down, Right, X, Y at the mode selection screen. The sound of a gun will confirm correct code entry.

Convert health to time:
Pause the game in arcade mode, then press Up(2), Down(2), Left, Right, Left, Right, A, B. The sound of a gun will confirm correct code entry.

Convert time to health:
Pause game play in arcade mode, then press B, A, Right, Left, Right, Left, Down(2), Up(2). The sound of a gun will confirm correct code entry. Five seconds from the timer will be converted to one half of a life. This code can be repeated.

Alternate controls:
A Dreamcast mouse can be used to aim. Press Left Mouse Button to shoot, Right Mouse Button to toggle your targeting recital, and Thumb Button to pause game play. The Scroll Wheel will scroll through the menu options.

100 Challenge mode:
Successfully complete all nine Outdoor Shooting Range challenges to unlock 100 Challenge Mode.

Extra options:
Successfully complete the game under any difficulty setting to unlock a real time window and up to 8 health in the options menu. Alternately, accumulate over two hours of game play.

Successfully complete the game more that twice under any difficulty level to unlock infinite credits in the credit section of the options menu and +30 in the time limit section. Alternately, accumulate over three hours of game play to unlock the +30 time limit and over five hours for the infinite credits.

Hint: Extra life:
At the start of story mode in the second wave, a pool will appear randomly on one of the smaller buildings. Use your scope to zoom in on the pool and look for a woman in a bikini. If done correctly, instead of your regular scope it will be a pinkish red heart and you will gain an extra life. This also can be done on the highway level by looking for a pink car.

Hint: Highway level: Easy kills:
When on the highway level, instead of aiming for the men in cars, shoot the tires to kill them all at once. Repeat this at the Boss.

Hint: Rescuing the President: Lights out:
When rescuing the President from the enemy base, choose to parachute in and shoot out all the lights at the bottom so they cannot see you.