Control title screen:
At the title screen, press White to hear a gunshot and see a flash. Use the Right Analog-stick at the title screen to change the background color.

Control Codec sequences:
During a Codec sequence, press the Left Analog-stick or Right Analog-stick to move the faces. Click the Left Analog-stick or Right Analog-stick to zoom in. When using your Codec to contact Otacon or others in the game, press R to reveal Snake's or Raiden's thoughts about those persons, with some funny phrases. You will also hear who they really feel about their women.

In-game reset:
While playing a game, hold L + R and press Start + Select.

Digital camera:
Successfully complete the game. The digital camera will be available when a new game is started. Also, the digital camera is locate in Strut E Shell 1. Go to the bottom of the screen and locate the platform with three red lights on it. Climb up onto it and equip the Z.O.E. Box. When the conveyor stops, press Action to climb on. You will be taken to another room. Press Action again to get off and retrieve the Digital Camera. Exit the room in the same fashion.

Stealth, Bandanna and Wig bonuses:
Complete the following goals to get the Stealth (invisibility), Bandanna (unlimited ammo for Snake), and the Wig (unlimited ammunition for Raiden). To get Stealth and Bandanna, complete the Tanker mission three times on three different difficulty settings (all on the same saved file) and get all the dog tags. To get Stealth and Wig, complete the plant three times on three different difficulty settings (all on the same save file) and get all the dog tags.

Sunglasses:
After completing the game two times on the same difficulty, Snake and Raiden will be wearing sunglasses during cutscenes.

European Extreme difficulty:
Successfully complete the game under any difficulty setting.

Boss survival mode:
Successfully complete Sons Of Liberty under any difficulty setting.

Photograph mode:
Successfully complete bomb disposal mode, hold up mode (alternative missions), and eliminate mode to unlock photograph mode in the VR Missions.

Casting theater option:
Successfully complete Sons Of Liberty under any difficulty setting.

Ninja Raiden:
Successfully complete 50% of the VR missions as Raiden to unlock Ninja Raiden in the VR Missions.

Raiden X:
Successfully complete 100% of the VR missions as Raiden and Ninja Raiden.

Pliskin:
Successfully complete 50% of the VR missions as Snake.

Tanker chapter: Marines in boxer shorts:
You can make the Marines in the Tanker chapter appear in their underwear in the room where Metal Gear is being held. Press White two or three times when start at the title screen then select the normal difficulty setting. When you get to where you have to take pictures of Metal Gear, the nearby marines will not be wearing their pants.

Tuxedo Snake:
Successfully complete 100% of the VR missions as Pliskin.

Metal Gear Solid 1 Snake:
Successfully complete 100% of the VR missions as Snake, Pliskin, Tuxedo Snake, Raiden, Ninja Raiden, and Raiden X.