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Cheat mode:
Add '-cheatenable' into command line of the game (mgsi.exe -cheatenable)and use the following keys in game:

F2 = God mode. Please be patient about this mode ability to
switch off, so if you see life amount decreasing just press F2 again.

F4 = Sometimes (I haven't idea about this undeterministic work) makes infinite ammo.

F5 = Normal view mode. Useful after F6 (see later) effect.

F6 = Observe mode. Seems the camera places into the center of
the level and you can navigate it. Use F5 to turn back to normal mode.

F7 = Fast level restart (NOT reload!). You will be placed at
level start but will have all that you have before key press.

F8,F9,F11,F12 = Some sort of texturing modes switching. Just experiment with this key by yourself.

Defeating vulcan raven
First enter -cheatenable at the properties screen by clicking right on the mgs shortcut.Then if done correctly start the game and press F2 then you have god mode on. play through the whole game untill you get at the warehouse where raven is.get near by him and toss granades at him.(they have more effect than the stinger and nikita rockets)
submitted by: foxhoundskull

Defeat sniper wolf at the snowfield
Get it all to sniper wolf at the snowfield(after the torturing) go all to the right. equip your nikita missile launcher and start launching missiles at her until she's death.(you wont lose life because she can't hit you)
submitted by: foxhoundskull

Alternate costumes:
Successfully complete the game, wait until the credits end, and save the game. Load the saved game file and play through the game again. After successfully completing the game a second time, wait until the credits end, and save the game. Load the saved game and play through the game again. Snake will change into a tuxedo in the elevator during this game.

Alternate ending and music:
Successfully complete the game with the Tuxedo costume.

Stealth gear:
Successfully complete the game under the easy difficulty level after submitting during the torture. Otacon will give your character the stealth gear after being saved. Allow the credits to complete, then save the game. Load the saved game to begin with the stealth gear.

Bandana:
Successfully complete the game without submitting to the torture. Your character will save Meryl and receive the Bandana. When equipped, the bandana will allow unlimited ammunition on any weapon.

Stealth gear and Bandana:
Use the following steps to get both the Stealth Gear and Bandana. When you complete the game by not submitting to the torture, you will only get the bandana. Simply submit to the torture to get both items.

Camera:
Reach area B2 of the tank hanger. At the end of the hallway to the right of the door where you fight revolver is a secret room that is entered after using C4 explosive. In the room are card 4 and card 6 doors. The camera is in the room behind the card 4 door. Use the camera to take pictures to see various extras, such as the faces of the development team.