Big Boss Extreme difficultyComplete the single-player mode once (and saving the cleared data).
New combat vestsClear the single-player game once.
WeaponsComplete the indicated task to unlock the corresponding weapon.
| Unlockable: | How to Unlock: |
| Bandanna | Complete a single-player session without killing anyone (including bosses). You can do this on any difficulty |
| Desert Eagle, Long Barrel | Earn the Fox emblem on a single-player session |
| Digital Camera | In the Nomad vehicle during the mission intermission; you can unlock a special photo by picking up this item in stage 4 instead of earlier |
| Patriot Future Assault Weapon | Earn the Big Boss emblem on a single-player session |
| Race (Ricochet) Gun | Clear the single-player game once |
| Scanning Plug S | Log more than 10 hours of Metal Gear Online play time on the same profile as your Metal Gear 4 game. You purchase this from Drebin |
| Solar Gun | Collect the five statues (those of the four Battle Beauties and the Frog Soldier/Haven Troopers in stage 1) using non-lethal means on their respective idols |
| Stealth Item | Complete a single-player session without instigating a single alert (caution is okay, but not alert). You can do this on any difficulty |
| Thor 45-70 | Earn the Fox Hound emblem on a single-player session |
| World War I Pistol | Earn the Hound emblem on a single-player session |
Face paintDifferent face paint unlocked for in game use.
| Unlockable: | How to Unlock: |
| Big Boss's | Earn the Big Boss emblem on a single-player session |
| Crying Wolf | Defeat the Battle Beauty (human form) Crying Wolf by non-lethal means. |
| Drebin | Purchase and keep more than 60 different weapons. |
| FaceCamo | Defeat the Battle Beauty Laughing Octopus (the overall battle, no specifics involved). |
| Laughing Octopus | Defeat the Battle Beauty (human form) Laughing Octopus by non-lethal means. |
| Otacon | Shock Dr. Emmerich using the Metal Gear II during the intermission scene. |
| Raging Raven | Defeat the Battle Beauty (human form) Raging Raven by non-lethal means. |
| Raiden Mask A | Shock Sunny using the Metal Gear II during the intermission scene. |
| Raiden Mask B | Shock Dr. Naomi Hunter using the Metal Gear II during the intermission scene. |
| Roy Campbell | Shock Colonel Campbell using the Metal Gear II during the intermission scene. |
| Screaming Mantis | Defeat the Battle Beauty (human form) Screaming Mantis by non-lethal means. |
Multi-player mode: Remove frosty breathWhen playing in stages where your breath frosts, have Snake play dead while prone. His frosty breath will no longer be seen by others.
Otacon's extra passwordsPut these in instead of the code Otacon tells you to at Shadow Moses. You will get the Access Denied scene but afterwards you will get the bonus.
| Password: | Result: |
| 12893 | 20% off on store |
| 78925 or 13462 | iPod song |
CostumesComplete the indicate task to unlock the corresponding costume.
| Unlockable: | How to Unlock: |
| Altair | Obtain the Assassin emblem |
| Civilian Disguise | Start Eastern Europe level |
| Middle East Militia Disguise | Middle East in the Militia Safe House |
| South American Rebel Disguise | South America (Cove Valley Village) |
| Suit | Clear the game once |
No More CamoShake the Sixaxis controller to return Snake's Octocamo to its neutral (black and blue) pigmentation.
iPod TunesSnake's iPod can download specific tunes throughout the course of the game. Some songs have an additional "secret" effect when it is played in the game.
| Unlockable: | How to Unlock: |
| Beyond the Bounds (increases stun damage done by Snake from non-lethal weapons) | Stage 4 Shadow Moses, Tank Hangar. After power is restored, backtrack to the upper catwalk and explore all rooms |
| Big Boss (increase stun damage and increases Snake's accuracy when played) | Earn the Big Boss emblem |
| Bio-hazard (cause soldiers held by Snake to scream in terror) | Stage 3 Europe, Midtown |
| Destiny's Call (cause soldiers held by Snake to go enraged) | A random gift from a militia or rebel soldier if Snake gives them a healing item |
| Flowing Destiny (cause soldiers held by Snake to weep like a little girl) | Stage 4 Shadow Moses, Canyon. Before leaving the canyon area, examine the rocky walls for a hole hiding this item |
| Fury, The (cause soldiers held by Snake to go enraged) | Stage 2 South America, Cove Valley Village. Inside the fire ravaged house |
| MGS 4 Love Theme / Action (cause soldiers held by Snake to weep like a little girl) | A random gift from a militia or rebel soldier if Snake gives them a healing item |
| Opening - Old L.A. 2040 (increase Snake's accuracy) | Stage 4 Shadow Moses, Nuclear Warhead Storage B2. Input 78925 into Otacon's lab computer |
| Policenaughts Ending (cause soldiers held by Snake to fall asleep on touch) | Stage 4 Shadow Moses, Nuclear Warhead Storage B2. Input 13462 into Otacon's lab computer |
| Rock Me (increases Snake's amount of life recovered from items and other means) | Stage 2 South America, Confinement Facility. Island in the south-eastern quadrant |
| Sailor (increases Snake's amount of life recovered from items and other means) | Stage 2 South America, Vista Mansion. Between the east wall and a cargo container |
| Show Time (cause soldiers held by Snake to scream in terror) | A random gift from a militia or rebel soldier if Snake gives them a healing item |
| Snake Eater (increase the life recovery rate of Snake through items and other actions) | Unlocked by earning all 40 game clear emblems |
| Subsistence (increase Snake's accuracy) | Play at least one game of Metal Gear Online. You must start the match with at least two players |
Extras Screen PasswordsThese passwords are entered at the Extras screen under Password after beating the game once on any difficulty.
| Password: | Result: |
| thomas | Unlocks "Desperate Chase" iPod Song |
| george | Unlocks "Gekko" iPod Song |
| theodore | Unlocks "Midnight Shadow" iPod Song |
| abraham | Unlocks "Mobs Alive" iPod Song |
Shoot from inside a dumpsterThere are dumpsters throughout the game which you can use to hide. Move in front of them and press
Triangle when the prompt appears. Once inside, if you have a handgun, for example The Operator, you can hold
L1 to lift up the lid of the dumpster and aim your gun from inside.
InheritenceYou carry over your Drebin points, weapons, ammunition, items, and special items from a previous game upon game clear. However, Snake will need to encounter Metal Gear II in the first stage to get his stuff back.
Be sure to save your cleared data upon game completion to track your items. Load the cleared data to reap your benefits.
Control intermission sequencesDuring an intermission sequence, press
D-pad Up to zoom the camera in then use the
Right Analog-stick to pan the camera around. The harder you press
Up, the more zoomed in the camera view. Also, some intermission sequences have prompts to see it through Snake's eyes by holding
L1 (look for the icon at the top left of the screen); or view flashback images by repeatedly tapping
X when a prompt appears (look for the icon at the top right of the screen). You can also pause an intermission sequence by pressing
Start.
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