Control intermission sequences:
Much like the Codec transmissions, you can also press L1 or R1 to zoom in during an intermission. The harder you press, the more the zoom. You will hear a gunshot. While holding the button, use the Right Analog-stick to move the view. Also during certain parts of some intermissions are sections where it looks like you are viewing the scene through a camera or binoculars. You can use the zoom feature with these as well, and the onscreen distance or zoom indicators will increase realistically the more you zoom in. This also can be done at the beginning of the game, before pressing Start.

Control title screen:
Press L2 to hear a gunshot and see a flash at the title screen. Use the Right Analog-stick at the title screen to change the background color.

Control Codec sequences:
Press the L1 or R1 to move the faces. Press L1 for a negative response such as \"No way\" or \"Why don\'t you do it?\". Press R1 for positive responses. The responses change depending on who you are talking to. You will also hear who they really feel about their women.

In-game reset:
Hold L1 + R1 + L2 + R2 and press Start + Select during game play.

Digital camera:
Successfully complete the game. The digital camera will be available when a new game is started.

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, Snake and Raiden will be wearing sunglasses.

European Extreme difficulty:
Successfully complete the game under the normal 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.

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.

Alternate ending sequence:
Successfully complete a Snake Tale to unlock the M9. Begin game play and use M9 to stun the Bosses instead of killing them to view an alternate ending sequence.

Hint: 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 L2 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.

Hint: Tanker chapter: USP Suppresser:
After completing the game once and saving it, start a new game with the saved data. On the Navigation Deck after the battle with Olga, go up the ladder to where you would normally get the Thermal Goggles. On the middle platform, before the goggles, should be a USP Suppresser on the left. You can now equip the USP with it and muzzle the gunfire for the rest of the Tanker chapter.

After you complete the Tanker chapter three or four times, you can find the USP Suppresser on the navigational deck after you defeat Olga. It is located on the second floor on the lookout, near where the thermal goggles are found.

Hint: Tanker chapter: Secret passage:
In the Holds 2 room, go all the way to the left to find a hatch. Open it, and you will climb down into a small area. Crouch and go through the vent on the ground. You will eventually see a gun clip fall through and a man will start talking. His shadow will be on the ground. Wait there until his shadow leaves, then move through the area. After you get past that, you will reach an opening and an intermission sequence will begin. After it ends, crawl through a vent on the right side of the small room. After you crawl through, you will find a ladder. Climb up the ladder, and it will lead you to a small perch. Look down at the bottom of Metal Gear RAY, and you will see Ocelot standing there. He will then go away. You can keep doing this and experiment with things to do with Ocelot.

Hint: Tanker chapter: Vulcan Raven action figure:
Immediately when you enter the engine room, there is a small Vulcan Raven figure standing on the ground with a flashlight shining on it. If you shoot it, it will start shooting very small balls around and will repeatedly say \"Raven!\", or something similar.

Hint: Avoiding alert mode:
When a patrolling guard sees you, run into a room where the screen goes black and tells you where you are. The game will not go into alert mode, evasion mode, or caution mode.

Hint: Easy radio shots:
To knock out an enemy\'s radio easily, when you hold them up shoot it (on the belt to the right of their back). Also shoot an enemy\'s radio when they are knocked out to prevent them from calling for help if they wake up.

Hint: Deactivating C4 bombs:
When deactivating the \"Baby C4 bombs\", the last one for the very easy and easy difficulty settings is under the submarine hanging from the ceiling in the bottom of Strut A Shell 1, where you started out as Raiden. The one on the hard difficulty settings always move around the room, usually in the caged area under the stairs or behind the computer controls.