Metal Gear Solid is a stealth-based game directed by Hideo Kojima. The game was developed by Konami Computer Entertainment Japan and first published by Konami in 1998 for the PlayStation video game console. It was well-received publicly and critically, shipping more than six million copies. It is the fourth title to be released in the Metal Gear series (the fifth in the official canon) and a direct sequel to Metal Gear 2: Solid Snake.

Metal Gear Solid's story centers on Solid Snake, a retired soldier who infiltrates a nuclear weapons disposal facility to neutralize the terrorist threat from FOXHOUND, a renegade Special Forces unit. He attempts to liberate their two hostages, the head of DARPA and the president of a major arms manufacturer and stops the terrorists from launching a nuclear strike. Snake also confronts and defeats members of FOXHOUND.

Cheats

Tuxedo Costume
Complete the game and save it after the credits end. Load the game and complete it again. Save the game after the credits end. Load the game once more and begin playing. Snake will change into a tuxedo in the elevator during the game.

Codes

All Weapons
Start the game with msg.exe -cheatenable in the command line. Then in game use the following codes:

Backspace + 7 - C4

Backspace + 6 - Claymore

Backspace + 2 - Famas

Backspace + 3 - Grenade

Backspace + 4 - Nikita

Backspace + 0 - PSG-1

Backspace + 1 - Socom

Backspace + 5 - Stinger

Backspace + 8 - Stun/Chaff Grenade

Backspace + 9 - Stun/Chaff Grenade

Cheat Codes
Start the game with mgsi.exe -cheatenable in the command line. Then press the following keys during the game:

F4 - Infinite Ammo (only in certain areas)

F5 - Normal View

F6 - Observe Mode (Camera can be moved)

F7 - Restart level w/ all collected items

F2 - Restore health

F8, F9, F11, F12 - Toggle graphics textures

Unlockables

Demo Theater Mode
Beat the game with either Meryl or Otacon ending to unlock this option. Plays all the Cutscenes and Codec calls threw the whole game depending on what ending you picked.

Infinite Ammo:
Do not submit to Ocelot Torture and you will get the Meryl Ending after you beat the game. When you load up the save file you will now have a "Bandanna" in your inventory. When the Bandanna is equipped, you will now have Infinite Ammo.

Stealth Camo:
Do submit to Ocelot Torture and you will get the Otacon Ending after you beat the game. When you load up the save file you will now have a "Stealth Camo" in your inventory. When the Stealth Camo is equipped, you will now be Invisible to the soldiers. (Except for the Bosses, they will be able to see you)

Secrets

Animal rights
Shooting crows and rats will make Roy and Naomi upset. They'll contact you through your codec and tell you how mean you are.

Easier ninja
While fighting the ninja throw a chaff grenade and he will freeze letting you hit him. Once you hit him he will fall to his knees and won't get up until all the yellow dust from the chaff grenade has fallen.

Watch the vieo below as it shows the game's bad ending, the one you get if you lose it during the torture minigame: