Unlockable: Bandana and Unlimited Ammo

Complete the game once with Meryl's ending.



Unlockable: Boss Survival

Complete the game once with either ending.



Unlockable: Camera

Locate the camera in the Armory South area, just south of the Revolver Ocelot battle. Blow up a wall to the east, and behind a security door you'll find the camera. Crawl under the fence to obtain the camera.



Unlockable: Extreme Difficulty

Complete the game once through.



Unlockable: Meryl Demo Tape

Complete the game once, getting Meryl's ending by not submitting to Ocelot's torture.



Unlockable: Meryl and Otacon Costumes

Complete the entire game twice, getting either Meryl's ending twice to unlock Meryl's costume, or getting Otacon's ending twice to unlock Otacon's costume.



Unlockable: New Ending Theme Song

Complete the entire game three times.



Unlockable: Otacon's Demo Tape

Complete the game once, getting Otacon's ending by submitting to Ocelot's torture.



Unlockable: Stealth Camouflage

Complete the game once with Otacon's ending.

Unlockable: Tuxedo Costume for Snake
Complete the entire game twice.

Hint: Cut-Scene Camera Control
During cut-scenes, pull the R trigger to zoom in. Once zoomed, you can use the C-STICK to pan the camera around and pick your shot.

Hint: Escape Medical Room Prison Variation
After the torture room scene, Otacon will come to Snake give you all the items you need to escape the holding cell.

Alternatively, if you wait even longer the Ninja will come and open the door for you...forcefully.

Hint: Faster Grip Level Up
Find an area with two cat-walks, one over the other. (such as the left side of bay where Metal Gear is stored) and move yourself to hang over the edge.

Now, here comes the difficult part. Drop down when you feel ready and rapidly press the action button so you grab onto the lower cat-walk. It may be dangerous (because if your timing is off, you will die), but after 5 or so times of doing it, your grip level will be at Level 2. Keep doing it for level 3. It's much more faster than the pull up method.

Hint: Get Peed On and Make Friends with Wolves
After fighting Psycho Mantis, follow Meryl through the wolf den. At the end of the den Meryl will be waiting with two wolves. Hit Meryl once and then quickly hide inside of a box. Meryl will instruct the pup to pee on Snake. You can now walk through the wolf den, while having the box equipped, without being attacked by the wolves.

Hint: Meryl in Her Panties
When in the Holding Cells area, crawling through the vents to find the DARPA Chief, you'll first see Meryl doing exercises in her cell. Before going forward to meet the DARPA Chief, exit the vent the same way you came in and re-enter to see Meryl doing exercises in her undewear. You can leave the vent and come back once again to see her performing other exercises.

Hint: Restore Health in Ninja Fight
When fighting the Ninja in Otacon's office, look in the northeast corner of the room for two miniatures of old Nintendo favorites. If you shoot Mario in first person view a "1UP" will appear over his head, and Snake will gain a bit of health. You can use this as much as you want, during the Ninja fight and afterwards.

Hint: Through Psycho Mantis' Eyes
During the scene where Meryl is being controlled by Psycho Mantis and is standing by the opened level 5 door leading to the commissioner room, zoom in on Meryl using the first person view and after a while, a distorted view will appear and you will be looking at Snake from a view which appears to be from Psycho Mantis. The view will give a black and white surviellance camera look at Snake with breathing noises in the background that sounds like its coming from Psycho Mantis.

Hint: Upset Meryl
Right after you meet Meryl in the Restroom of the Nuke Building, Go into first person mode and stare at her breats. She will spit out comments like "Why are you staring at my...?" or "Don't look at me like that!"

Easter Egg: Alexandra Roivas in a Girlie Mag
One of the girlie magazines you can pick up features Alexandra Roivas from Eternal Darkness. Just open the magazine and zoom in to see her in a bikini.

Easter Egg: Alter Psycho Mantis' Speech
When you meet Psycho Mantis in the Nuke Building he'll show off his psychic abilities by reading your memory card. If you have game saves for The Legend of Zelda: The Wind Waker, Super Smash Bros. Melee, Super Mario Sunshine, or Eternal Darkness, he will mention that you like to play those games.

Easter Egg: Anubis Poster
There is yet another egg in the Otacon's office. On the wall is a poster of Zone of the Enders: Anubis, which Otacon mentions during the cut scene. Fans of the game will recognize the poster as the game's box art.

Easter Egg: Eternal Darkness Poster
In the Armory, B2 of the Tank Hangar, there are six separate rooms. If you go inside the top far right room, there is a locker with an Eternal Darkness game poster inside.

Easter Egg: GameCube and Wave Bird
In Otacon's office, take a look at the desk to find a GameCube and Wave Bird. In addition, look at the monitor nearby to see the GameCube boot-up screen.

Easter Egg: Make Mei Ling Mad
Using your very cool and high tech codec call Mei Ling. When giving the option of saving or not select not saving. Do this a few times and eventually she'll give you a brief talking to and she'll stick her tongue out. Not very professional Mei Ling.

Easter Egg: Meryl in Her Panties (again)
We all know Snake is a ladies man (and a pervert,) so I believe this cheat suits him. After the battle with The Ninja you are sent on a mission to find Meryl who is wearing and enemy uniform on the floor B1. Once you discover her she will the make a run for the girls bathroom to the right of the elevator. Be in hot pursuit and make it to the bathroom at least a few seconds behind her and through out that whole cut seen she will be in her underwear. You go Snake!

Easter Egg: Outer Heaven Nametag
After the scene where the Ninja kills all the soldiers outside the Lab, Look at the soldier closest to the door. You have to look down using your scope, but his nametag says "Outer Heaven". You'll get a better camera angle if you look at it upsidedown.

Easter Egg: See Yoshi and Mario
After your battle with Ninja, take a time to look around Otacon's office. You'll see a Yoshi and Mario statue on a filing cabinet. Shoot the Yoshi and he will make his classic noise. Shoot Mario and a 1Up will appear above his head. In addition, you will get a health bonus with each 1Up.

Easter Egg: Silicon Knights Website
Behind the Level 2 security door in the Tank Hangar, look at the computer closest to the door. It was a Silicon Knights website pulled up.

Easter Eggt: Meryl’s Taunt
After you go through the wolf caves and end up in the minefield (right before Meryl gets shot by Sniper Wolf). After Meryl crosses, run into a mine. Keep doing this. Meryl will then whistles and slap her rear. Repeat this to see her do it again.

Cheat List

Enter the following codes at the title screen:

• Credits: Y, B, X, Y, Y, B, X, Y, B, X, Y, B, B, X, Y, B, X, Y, B, X, X, Y, B, X
  Invincibility: Y, B, B, X, X, X, Y, Y, B, B, B, X, X, X, B, Y, X, X, X, B, X, Y, X, X,
• B, X, X, Y, X, B, X, X, X, Y
  
• Level Select: Y, Y, Y, B, B, X, B, Y, X, B, Y, B, Y, B, Y, X, Y, Y
  
• Reward Level: Y, B, X, X, B, Y, Y, B, X, X, B, Y, Y, X, B, Y, B, X, X, B, Y

Cheat: Co-op Share Cheats

During gameplay, pause and hold L + R, then enter the following cheats.