Technical demonstration mode
Beat the following modes in order "Training", "Time Trial", "Gun Shooting", "Survival".
Note: Completing each mode will unlock the next mode in the sequence. Then, "Technical demonstration" mode will be unlocked. Use it to watch the CPU demonstrate its best time with the gun.

Infinite ammo
Successfully complete the game without submitting when being tortured to save Meryl. Then at the end of the game you will receive a bandana. Save your game and then start a new game using the saved game. Now when you equip the bandana you can use an unlimited amount of ammo and will not have to reload your gun.

Stealth camouflage
Successfully complete the game with submitting when being tortured to not save Meryl. Then at the end of the game you will receive stealth camouflage. Save your game and then start a new game using the saved game. Now when you equip the Stealth Camouflage enemies (except bosses) and cameras will not detect you.

Camera
Reach area B2 of the tank hanger. Then, at the end of the hallway to the right of the door where you fight Ocerot is a secret room that is entered after using C4 explosive. In the room are security card level 4 and 6 doors. The camera is in the room behind the security card level 4 door. Alternatively, beat the game with submitting when being tortured. After you receive the camera there will be an "Album" option on the main menu, use this option to view pictures that have been taken.

New textures
Successfully complete the game two times using the same saved game location, and getting a different ending both times by getting the bandana and stealth camouflage. Then, next (third) time reach Ninja without using the bandana or stealth camouflage. If done correctly, Ninja will be red. There will now be new textures for Snake and Ninja and new bonus music during the ending.

Alternate costume
Successfully complete the game two times using the same saved game location, and getting a different ending both times by getting the bandana and stealth camouflage. Then, Snake will change into a tuxedo in the elevator during the next (third) time the game is played. Successfully complete the game once more, without using the bandana or stealth camouflage until reaching Ninja. If done correctly, Ninja will be red. Then, Snake will change into a ninja costume during the next (fourth) time the game is played.

Alternate title screen
At the title screen, press the D-pad to change the background color.

Codec frequencies

Name	Frequency
Campbell/Naomi	140.85
Mel Ling	140.96
Master	141.80
Otacon	141.12
Meryl	140.15
Nastasha	141.52
Deepthroat	140.48

Konami game surprise
Play the game using a memory card that contains a saved game from any prior Konami title (Castlevania, ISS Soccer, Suikoden, Silent Hill etc.) Then, when Psycho Mantis attempts to read your character's mind, he will mention various game titles.

Pantless Meryl
Follow Meryl into the Women's bathroom and reach the last stall in under five seconds. Then, Meryl will be caught with her pants down during the next FMV sequence.

Humorous Meryl comments
Look at Meryl with the scope or camera.

Hints, tips, and tricks

• Box destinations
  Equip a box while in the trucks to travel to the destination on the boxes.

• Annoy Cambell
  Snipe the rats above where you first encounter Wolf or Snipe the ravens when at your second encounter with Raven.

• Defeating Psycho Mantis
  Plug the controller into port two and press any button before fighting Psycho Mantis. The word "Hideo" will appear in the corner of a black screen. Use controller two to fight against Mantis to keep him from knowing your moves.

• Seeing through Psycho Mantis' eyes
  When fighting Psycho Mantis, press Triangle to see through his eyes.

• Easier driving scene
  To get a better view when shooting at Liquid Snake in the driving scene, hold Triangle while shooting the gun.

Name	Location
Fujimura	Elevator in the Comm Tower B complex
Fukushima	Heliport; looking out to sea from cliff
Hirano	Elevator in Comm Tower B; deep in the shaft of top level
Ishiyama	Heliport top of building
Ito	Inside elevator to tank hangar
Jerem Blaustein	Sniper Wolf's corpse
Kaneda	The mirror located in the Women's restroom
Kimura	MG underground base; tip of Metal Gear 's railgun
Kinbara	Dark area of stairs
Kitao	Decoy Octopus (fake DARPA chief) corpse
Kobayashi	Rock in canyon
Kobayashi	Johnny Sasaki holding cell, near DARPA chief
Kojima	Otacon lab; the picture frame to the right
Korekado	Men's restroom
Kozyou	Behind the watertank-like structure in the Canyon
Kutome	Observation room
Makimura	Hidden armory store room; behind the weakened wall
Matsuhana	Hallway of corpses; outside Otacons lab
Mizutani	When fighting Metal Gear
Mori	Lowest point of elevator; Comm Tower B
Mukaide	Reflection in wolfdog cave puddle
Muraoka	Water in cargo dock
Nakamura	In Meryl's blood pool; where she is sniped
Negishi	Sewage waterfall
Nishimura	Next to Baker's corpse
Okajima	Maggots of the real DARPA Chef in cell
Onoda	Where Baker is tied up
Sasaki	Picture frames in the Commander's room
Sato	Comm Tower A; roof destroyed by Hind D missiles
Scott Dolph	Deep down in the dark from the walkway between Comm Towers A and B
Shigeno	Heliport,security caera by staircase
Shikama	Electric floor
Shimizu	Wolf dog cave; first crawling point
Shinkawa	Deep in Sniper Wolf's hallway behind the second pillar
Sonoyama	Torture machine
Takade	Ninja room; glass atedga
Tanaka	Heliport; sleeping soldier
Tougo	End of boiler room; in Blast Furnace with the steam
Toyota	Container in the middle of Raven's warehouse
Uehara	Edge of elevator; where the ravens are
Yamashita	Tip of nuke warhead in nuke storage room
Yoshimura	Dead end of air duct
Yoshioka	Bridge on the third floor of the blast furnace