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Metal Gear Solid: The Twin Snakes

Glitches

Underwater gas mask

If you put on your gas mask while under water, your O2 gauge will decrease slower, just like it would while in a room filled with gas.

Contributed By: ThreeHeadedMonkey.

Unlockables

Misc. Unlockables

These secrets can be unlocked on any difficulty.

UnlockableHow to Unlock
Complete the game three timesAlternate ending theme
Beat the game with Meryls ending (Endure the torture)Bandana
Beat the game once.Boss Survival Mode
Beat the game twice.Crimson Ninja
Complete the game once.Extreme Difficulty Mode
Complete the game with Meryl's ending (don't submit during torture)Meryl Demo
Beat the game once as Tuxedo Snake while saving MerylMeryl Demo (Alternate Costumes)
Complete the game once with Otacon's ending (submitting into the torture)Otacon Demo
Beat the game once as Tuxedo Snake while saving OtaconOtacon Demo (Alternate Costumes)
Beat the game twiceSneaking Suit Meryl
Obtain the Camera and beat the gameStart with Camera
Beat the game with Otacons ending (Submit to the torture)Stealth
Beat the game with each ending.Tuxedo Snake

Contributed By: Sasuke Kusanagi, CAHowell, GodOfGaming, silverdragon2255, dinobotmaximized, mnftg64, and Chrimp.

Save Icons

UnlockableHow to Unlock
Beat the game with Meryl's ending, then save.Meryl Save Icon
Beat the game twice, then save.Ninja Save Icon
Beat the game once, then save.Otacon Save Icon

Contributed By: Son0fLiberty and CorvCRX.

Unlockable Ending Rankings

Every difficulty setting has unique unlockable rankings that may be unlocked depending on your performance throughout the game. Below are the possible unlockable rankings and the requirements to unlock them.

UnlockableHow to Unlock
Either be discovered at least 55 times and kill less than 4 OR be discovered 30-54 times and kill less than 8"ALLIGATOR" Hard Ranking - Rank 9
Either be discovered at least 55 times and kill at least 16 OR be discovered 30-54 times and kill at least 20"BAT" Normal Ranking - Rank 12
Finish in less than 3 hrs, kill 25 or less, use 1 ration or less, be discovered no more than 4 times, save less than 80 times, and do not continue"BIG BOSS" Extreme Ranking - Rank 1
Complete game in at least 18 hours and be discovered less than 30 times (enemies, rations, and saves do not matter)"CAPIBARA" Normal Ranking - Rank 6
Complete game in less than 18 hours, be discovered less than 30 times, and save game at least 80 times (enemies and rations do not matter)"CAT" Easy Ranking - Rank 5
Either be discovered less than 30 times and kill at least 20 OR be discovered 30-54 times and kill 16-19"CENTIPEDE" Hard Ranking - Rank 11
Be discovered less than 30 times and complete the game in at least 18 hours"CHICKEN" Easy Ranking - Rank 7
Either be discovered at least 55 times and kill less than 4 OR be discovered 30-54 times and kill less than 8"CROCODILE" Extreme Ranking - Rank 9
Complete game in less than 18 hours, be discovered less than 30 times, and save game at least 80 times (enemies and rations do not matter)"DEER" Normal Ranking - Rank 5
Finish in less than 3 hrs, kill 25 or less, use 1 ration or less, be discovered no more than 4 times, save less than 80 times, and do not continue"DOBERMAN" Normal Ranking - Rank 1
Finish in less than 2.5 hrs, kill less than 250, use less than 130 rations, be discovered less than 30 times, and save less than 80 times"EAGLE" Extreme Ranking - Rank 2
Complete game in less than 18 hours, use at least 130 rations, be discovered less than 30 times, and save game less than 80 times (kills don't matter)"ELEPHANT" Normal Ranking - Rank 4
Finish in less than 2.5 hrs, kill less than 250, use less than 130 rations, be discovered less than 30 times, and save less than 80 times"FALCON" Normal Ranking - Rank 2
Either be discovered at least 55 times and kill at least 16 OR be discovered 30-54 times and kill at least 20"FLYING FOX" Hard Ranking - Rank 12
Either be discovered at least 55 times and kill at least 16 OR be discovered 30-54 times and kill at least 20"FLYING SQUIRREL" Easy Ranking - Rank 12
Finish in less than 3 hrs, kill 25 or less, use 1 ration or less, be discovered no more than 4 times, save less than 80 times, and do not continue"FOX" Hard Ranking - Rank 1
Complete game in at least 18 hours and be discovered less than 30 times (enemies, rations, and saves do not matter)"GIANT PANDA" Extreme Ranking - Rank 6
Finish in less than 2.5 hrs, kill less than 250, use less than 130 rations, be discovered less than 30 times, and save less than 80 times"HAWK" Hard Ranking - Rank 2
Complete game in less than 18 hours, be discovered less than 30 times, and save game at least 80 times (enemies and rations do not matter)"HIPPO" Extreme Ranking - Rank 5
Finish in less than 3 hrs, kill 25 or less, use 1 ration or less, be discovered no more than 4 times, save less than 80 times, and do not continue"HOUND" Easy Ranking - Rank 1
Either be discovered less than 30 times and kill 8-19 OR be discovered 30-54 times and kill 8-15"HYENA" Normal Ranking - Rank 10
Either be discovered at least 55 times and kill less than 4 OR be discovered 30-54 times and kill less than 8"IGUANA" Normal Ranking - Rank 9
Either be discovered less than 30 times and kill 8-19 OR be discovered 30-54 times and kill 8-15"JACKAL" Hard Ranking - Rank 10
Be discovered less than 30 times AND kill less than 8 enemies"JAGUAR" Extreme Ranking - Rank 8
Finish in less than 18 hrs, kill at least 250, use less than 130 rations, be discovered less than 30 times, and save less than 80 times"JAWS" Hard Ranking - Rank 3
Complete game in at least 18 hours and be discovered less than 30 times (enemies, rations, and saves do not matter)"KOALA" Easy Ranking - Rank 6
Either be discovered at least 55 times and kill less than 4 OR be discovered 30-54 times and kill less than 8"KOMODO DRAGON" Easy Ranking - Rank 9
Be discovered less than 30 times AND kill less than 8 enemies"LEOPARD" Normal Ranking - Rank 8
Complete game in less than 18 hours, use at least 130 rations, be discovered less than 30 times, and save game less than 80 times (kills don't matter)"MAMMOTH" Hard Ranking - Rank 4
Either be discovered less than 30 times and kill 8-19 OR be discovered 30-54 times and kill 8-15"MONGOOSE" Easy Ranking - Rank 10
Be discovered less than 30 times and complete the game in at least 18 hours"MOUSE" Normal Ranking - Rank 7
Eighter be discovered at least 55 times and kill at least 16 OR be discovered 30-54 times and kill at least 20"NIGHT OWL" Extreme Ranking - Rank 12
Finish in less than 18 hrs, kill at least 250, use less than 130 rations, be discovered less than 30 times, and save less than 80 times"ORCA" Extreme Ranking - Rank 3
Be discovered less than 30 times and complete the game in at least 18 hours"OSTRICH" Extreme Ranking - Rank 7
Be discovered less than 30 times AND kill less than 8 enemies"PANTHER" Hard Ranking - Rank 8
Complete game in less than 18 hours, use at least 130 rations, be discovered less than 30 times, and save game less than 80 times (kills don't matter)"PIG" Easy Ranking - Rank 4
Finish in less than 2.5 hrs, kill less than 250, use less than 130 rations, be discovered less than 30 times, and save less than 80 times"PIGEON" Easy Ranking - Rank 2
Finish in less than 18 hrs, kill at least 250, use less than 130 rations, be discovered less than 30 times, and save less than 80 times"PIRANHA" Easy Ranking - Rank 3
Be discovered less than 30 times AND kill less than 8 enemies"PUMA" Easy Ranking - Rank 8
Be discovered less than 30 times and complete the game in at least 18 hours"RABBIT" Hard Ranking - Rank 7
Either be discovered less than 30 times and kill at least 20 OR be discovered 30-54 times and kill 16-19"SCORPION" Extreme Ranking - Rank 11
Finish in less than 18 hrs, kill at least 250, use less than 130 rations, be discovered less than 30 times, and save less than 80 times"SHARK" Normal Ranking - Rank 3
Complete game in at least 18 hours and be discovered less than 30 times (enemies, rations, and saves do not matter)"SLOTH" Hard Ranking - Rank 6
Either be discovered less than 30 times and kill at least 20 OR be discovered 30-54 times and kill 16-19"SPIDER" Easy Ranking - Rank 11
Either be discovered less than 30 times and kill at least 20 OR be discovered 30-54 times and kill 16-19"TARANTULA" Normal Ranking - Rank 11
Either be discovered less than 30 times and kill 8-19 OR be discovered 30-54 times and kill 8-15"TASMANIAN DEVIL" Extreme Ranking - Rank 10
Complete game in less than 18 hours, use at least 130 rations, be discovered less than 30 times, and save game less than 80 times (kills don't matter)"WHALE" Extreme Ranking - Rank 4
Complete game in less than 18 hours, be discovered less than 30 times, and save game at least 80 times (enemies and rations do not matter)"ZEBRA" Hard Ranking - Rank 5
Be discovered less than 30 times and use at least 130 rationsAlternate Method #1 for "CHICKEN" Easy Ranking - Rank 7
Be discovered less than 30 times and use at least 130 rationsAlternate Method #1 for "MOUSE" Normal Ranking - Rank 7
Be discovered less than 30 times and use at least 130 rationsAlternate Method #1 for "OSTRICH" Extreme Ranking - Rank 7
Be discovered less than 30 times and use at least 130 rationsAlternate Method #1 for "RABBIT" Hard Ranking - Rank 7
Be discovered less than 30 times and have saved the game at least 80 timesAlternate Method #2 for "CHICKEN" Easy Ranking - Rank 7
Be discovered less than 30 times and have saved the game at least 80 timesAlternate Method #2 for "MOUSE" Normal Ranking - Rank 7
Be discovered less than 30 times and have saved the game at least 80 timesAlternate Method #2 for "OSTRICH" Extreme Ranking - Rank 7
Be discovered less than 30 times and have saved the game at least 80 timesAlternate Method #2 for "RABBIT" Hard Ranking - Rank 7
Be discovered at least 55 times and kill 4-15Alternate Method for "HYENA" Normal Ranking - Rank 10
Be discovered at least 55 times and kill 4-15Alternate Method for "JACKAL" Hard Ranking - Rank 10
Be discovered at least 55 times and kill 4-15Alternate Method for "MONGOOSE" Easy Ranking - Rank 10
Be discovered at least 55 times and kill 4-15Alternate Method for "TASMANIAN DEVIL" Extreme Ranking - Rank 10

Contributed By: BolerosCloud.

Easter Eggs

Cameo: Alex from Eternal Darkness

Lay any book on the ground, then go into first person view. Look at the magazine and you will see Alexander Roivas from Eternal Darkness: Sanity's Requiem.

Contributed By: pacokorn77.

Cameo: GC and WaveBird controller

Go into Otacon's lab (where you fought the ninja), then go to the middle desk and look at the monitor. There you will see a Gamecube with a WaveBird controller next to it.

Contributed By: pacokorn77.

Cameo: Mario and Yoshi

In Otacons lab, you can find Mario and Yoshi figurines on top of a computer monitor. If you zoom in on Mario's head and shoot it, a 1-up message will appear over his head.

Contributed By: JustinChar99.

Creep Out Meryl:

Right before entering the room where you fight Psycho Mantis, stare at Meryl in first person mode and she will tell you that you are creeping her out and to stop doing that.

Contributed By: Zabat.

Developer Cameos

In the room where you fight Psycho Mantis, the portraits on the back wall are(left to right) cut-scene director Ryuhei Kitamura, Metal Gear Solid creator Hideo Kojima, and president of Silicon Knights, Denis Dyack.

Contributed By: mario masta.

Different Psyco Mantis sayings

Have either a Eternal Darkness, Legend of Zelda: The Wind Waker, Super Mario Sunshine, or Super Smash Bros. Melee save on the memory card you are using to save, and he will mention them before the boss fight.

Contributed By: CAHowell.

Eternal Darkness Poster

In the armory room is a room full of nikita equipment. Inside is a locker. Open it up and there will be an Eternal Darkness poster inside.

Contributed By: Sonic5688.

Make Mei Ling Angry

If you call Mei Ling three times in a row and choose not to save, she'll yell at you for calling her for no reason. After this, she will stick her tongue out at you occasionally.

Also, right after you follow Meryl into the women's room, but before you trigger the cut scene, call Mei Ling and she'll yell at you for being a pervert, and won't let you save your game.

Contributed By: Larcen Tyler.

See Meryl's Underwear

When you first get to the Holding Cells area, and are going through the ventilation shafts to get to the DARPA Chief's cell, you will see a cutscene of Meryl in a prison cell, doing exercises. After the scene ends, you can look down into the cell to view her exercises anytime. If you go back out the cells the way you came in, and then come back to the vent above Meryl's cell, she will not have any pants on when you look down at her.

Contributed By: Evil Dave.

Snake's Haircut

In the 'Briefing' section in the title menu, watch every video available, including ones that are added to the list as you've watched more. Once you've seen every video (they will all have a check mark in the box next to them), choose 'Exit' from the list. You will then hear a hidden conversation that explains why Snake's haircut is different from how it appeared in Metal Gear 2: Solid Snake.

Contributed By: Evil Dave and Joseph Collins.

ZOE 2: The Second Runner Cameo

In the fight against the Ninja you can see a poster hanging from the back wall from Zone of Enders 2: The Second Runner.

Contributed By: ido x.

Secrets

A more useful cardboard box

When you're in the cave area with Meryl, hit her and quickly equip a cardboard box. She'll order a wolf to attack you, but if you're in a box, a wolf will pee on it instead. Now whenever that box is equipped the wolves will no longer attack you.

Contributed By: dinobotmaximized.

Cardboard Box Uses

You can use the cardboard boxes you find for transportation. Simply equip the cardboard box that corresponds with where you want to go (there are three boxes in total - one labeled 'Helipad,' one labeled 'Nuke Building,' and one labeled 'Snowfield') when you are inside the back of one of the parked trucks. Eventually, a guard will appear, and you will be transported to the area labeled on your box.

Contributed By: Evil Dave.

Control camera during briefing.

Select briefing from the main menu.Then press the LEFT TRIGGER or RIGHT TRIGGER to switch between 4 cameras.Use the analog stick or D-PAD to move the camera around.

Contributed By: Ecstacy2003.

Cutscene Zoom

During any cutscene you can zoom the camera in with the R button and move it around with the C-stick.

Contributed By: numbtooth.

Easier ninja

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

Contributed By: Ecstacy2003.

Easily cross mine fields.

If you want to easily cross mine fields, but you don't have the mine detector, just crawl on the ground where you believe mines are. Not only will receive no damage, but you'll also automatically collect all mines you crawl over!

Contributed By: Felix Arabia.

Extra Damage to Ninja

If you have a weapon equipped and press "B" to punch Ninja, you'll deal extra damage to him. The nikita is the strongest, though it is very slow. FAMAS and Socom are the same speed, but the FAMAS is more powerful.

Contributed By: AdamLazaruso.

Higher Grip Lv.

When you hang from a ledge, do 100 pull ups (L + R). They have to be good pull ups. Grip Lv "3" is the maximum grip Lv.
Tip: In grip Lv1, you can only fit 4 good pull ups. Dont rush it. Once Snake does a good pull up let go of both buttoms, not just one.

Contributed By: Scarface25.

Otacon's Ending

To view Otacon's Ending instead of Meryl's ending after completing the game, submit to Ocelot's torture after being captured.

Contributed By: UltimaterializerX.

Repel wolfs with sniper wolf hanky

when you go backtracking through the cavern after getting Sniper wolf's hanky. Equip it and the wolves think you're Sniper wolf and will appear to love you.

Contributed By: Gamesmeister.

Replenish health during Ninja fight

When fighting the Ninja in the computer room, go to the top right corner of the room and shoot Mario on top of the computer to replenish your health. If you shoot Yoshi, you will hear his voice.

Contributed By: Sasuke Kusanagi.

Spotting Mines without the Mine Detector

You can use the thermal goggles to actually see the mines.

Contributed By: revolutiongames.