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1: Altair's Costume
Want to sneak around in an Altair outfit? You can do it in two ways. First up is by collecting the Assassin emblem (defeat 50 enemies with CQC holds and knife kill, plus a maximum of 25 alert phases) or entering a password (which Konami has yet to reveal).

2: The Bandana
Snag the bandana by finishing MGS4 without killing a single person. Or just buy it from Drebin for 5m points (2.5m in Act 5). Wearing it also grants Snake infinite ammo.

3: Suit Up
Want to look suave stalking the streets of Eastern Europe and the Middle East? You need to get your hands on Snake's slick suit. To obtain it, just complete the game once. Be warned, though, it's not very useful for staying out of sight.

4: Rebel Rebel
The South American rebel disguise is another outfit you can get your hands on pretty easily. Simply rescue the rebels at the beginning of Act 2 by taking out the PMC member. The rebels then open up the door to the house behind them where, rather handily, you can find the disguise.

05 - 10: Camo Attack
Big Boss: One of the toughest face camos to get, you need to complete MGS4 in under five hours on the unlockable Boss Extreme mode.

Laughing Beauties: Simple to snare, just defeat bosses without using lethal force. When they've shed their skin tranq 'em in the face for the camo bonus.

Drebin: Everyone wants to play as the arms dealer. Just get hold of the 60-plus different weapons in the game and you'll be awarded the Drebin face camo. Shame about the hair, though.

Raiden: Another extremely simple camo to nab. During the Mission Briefing stages take control of the MK.II during any one of these scenes, and ram into Sunny with it. To unlock Raiden Camo B, just ram Naomi with the MK.II during Act 3's Mission Briefing.

Colonel Campbell: Easy one again: just take control of the MK.II once more during the Mission Briefing in Act I and ram Campbell with it. Now you can run around the jungle with the face of yet another withered old man just like Snake.

Otacon: Getting hold of the geeky Otacon face camo is really easy, and you can do it any time you want. Again, just operate the MK.II and ram it straight into Otacon, and the face camo will automatically become available for you to use.

11 - 15: Making the most of the Camera
Camera Man: Fancy taking a few pictures along the way? Then during the game's Mission Briefing cutscenes take control of the MK.II, and make your way to the end of the Nomad where you'll find the handy gadget. If you wait until Act 4's Briefing to find the camera, you'll be rewarded with an exclusive pic of Naomi in the Photo Album.

Poser: If you've got the camera in your inventory during face-offs with each of the Beauties, equip it during the 'white world' phase that each one enters after shedding their armour. Once you do that they'll all strike poses for you. How nice.

Ghost Hunter: There are 30 different hidden ghosts in the Shadow Moses maps.The only way you can see these spooky apparitions is by looking at them through the lens of the camera, and by having the Sorrow Doll equipped as your weapon.

Picture Perfect: Export your camera pics to your XMB so you can share them with the MGS-loving world. Head to the Main Menu; select Photo Album; select the pic; choose Normal Upload; confirm export and then head to the Photo option in your XMB.

The Exorcist: Yet another cool trick with the camera is being able to perform an exorcism. Head to the Photo Album, check out the ghosts on the screen, then simply select the option 'Exorcise'. The ghost disappears with a goofy little sound effect.

16: Stealth Camo
For stealth camo, finish the game without entering the alert phase. But remember Gekos will still be able to see you, and PMC soldiers will still hear footsteps.

17: Sick Boy
Want to see Snake throw his guts up all over the ground during a mission? Kill 50 soldiers during the course of any act in the game, and it will trigger the vomiting and a strange voice.

18: Naughty Naughty
During the fight with Laughing Beauty, attack her until her armour is discarded. Now move on to one of the beds in the research lab. She'll then climb on top of Snake for a little bit of kiss kiss, bang bang.

19 - 23: Collect the Dolls
Frog Doll: Reach the Advent Palace Garage in Act 1 without killing a Haven Trooper - the Frog Doll will be sitting there waiting for you.

Octopus Doll: If you knock Laughing Octopus's Psyche Gauge down to zero, you'll find this on a bed during the Laughing Beauty brawl.

Raven Doll: Beat Raging Raven with non-lethal weapons and you'll find this on the top floor's outer balcony during the Beauty fight.

Wolf Doll: Again, defeat Crying Wolf using non-lethal attacks and when she turns into a Crying Beauty, just look behind your starting position.

Mantis Doll: Another non-lethal takedown. Just wait until she becomes Screaming Beauty and the doll is at the north end of the area.

24: Kiss Kiss
During the final fight with Liquid Ocelot on the top of the ship, if you let him catch Snake in a chokehold during the third stage of the fight and don't press any button at all, Liquid will land a sneaky peck on Snake's cheek. Brotherly love, eh?

25: Crop Circles
During the mountain trail section of Act 3, take the left-hand route at the first major fork in the path to reach the river and you'll find a crop circle. Just stand in the centre of it until the audio track ends and you'll nab 1,000 Drebin points to spend on weapon upgrades. Easy money.

26: Royal Rumble
If you're playing with a rumble pad and reach the boss fight with Psycho Mantis in Act 4, you will experience a different kind of conclusive cutscene with him. Otherwise he just freaks out because you haven't got one and croaks it.

27 - 32: Emblems
These are the ranks - or code names as they're called in past games - that you earn after completing the game. Emblems are earned by completing secret requirements, which also give you in-game rewards. There are 40 Emblems to collect in total. Here are some of the best...

Big Boss: To unlock this you need to complete the game in Boss Extreme. Use zilch continues and alters; eat zero rations, kill no one; use no special items and complete the game in five hours. For this you get the Patriot gun, Boss face camo and Boss iPod tune.

Fox Hound: Play through the game on Boss Hard or higher; use zero continues; no more than three alerts; use zero health items; kill nobody and finish the game in five and a half hours. This unlocks the Thor pistol, which is a handgun-sized shotgun that holds just one bullet.

Fox: Finish the game on Solid Normal or higher; no continues; five alerts or fewer; no healing items; zero kills including bosses and complete the game under six hours. This earns you the ranking as well as the long-barrelled Desert Eagle for long-range attacks.

Hound: Finish the game in Normal or higher; no dying or failing missions; under three alerts; zero healing items; no kills (bosses included) and finish the game in six and a half hours. Success spells a Type 17 pistol with automatic and semi-automatic fire like a machine gun.

Chicken: Finish the game with 50 continues or more, 10-plus alerts, 50 and up healing items, 50 kills and 30-plus hours to earn the Corpse Camo.

Assassin: Kill/stun 50+ with the knife; get 50+ CQC holds, be discovered under 25 times. Unlocks the Altair disguise.

33: A Scanner Darkly
To unlock the Scanning Plug you have to play ten hours of Metal Gear Online. Once you've done this it's available for 10,000 Drebin Points. It can only be used during a CQC chokehold on a PMC soldier to interface with the nano-machines in his body.

34 - 37: Snake's special equipment
Race Gun: It's small. It's got naff range. What it does do though is fire ricochet bullets that can bounce off any surface. That means you can take someone out from around corners or behind cover!

Solar Gun: In order to get your hands on this mighty weapon, you need to have collected the entire Metal Gear Beast Doll and Frog Soldier line-up. It works a treat against Vamp, too!

Smoke Grenades: These really mischievous grenades have various effects on PMC soldiers (laughing, rage, crying and scream), and are available to you once you start your second playthrough of the game.

Emotion Bullets: Like the smoke grenades, these are available from the second playthrough of the game, and function in the very same way. They're fired via the MK.II pistol and Mosin-Nagant.

38: Controller Switch
Switch controllers during the Screaming Mantis battle and you'll see a Codec screen that harks back to the Psycho Mantis battle in MGS1.

39: More Metal Gear
When Snake meets Big Mama, she rattles through previous MGS games. Note the two empty save slots after MGS4... the series is far from over.

40 - 43: Feel the beat
Oishii Chuhan Seikatsu: While fighting the Beauties, play this song and it will make them start dancing. Sunny will also be dancing if you pause the game and look at the on-board camera.

MGS4 Love Theme: Grab this when you earn respect from the rebels by giving them items and pressing w. This will put a soldier in a CQC chokehold - laugh your ass off as they cry.

Rock Me, Baby: You'll find this one inside the storage container in Act 2. When you play it, stay prone and watch as your life recovery increases. Keep an eye out for the Sailor tune, too.

Old L.A. 2040: In Otacon's office in Act 4 enter the code '78925' when you're asked. Playing this song stops Snake's hand from shaking when he's holding a sniper rifle. Very useful indeed.

44: Mo-Cap Stars
When a character appears in the game for the first time during a cutscene, the name of the actor voicing them usually appears on screen. To see who was responsible for the motion-capture work at any time, just press the R2 button.

45: Handy Men
During the Mountain Trail section of Act 3, when you run into a PMC standing over a claymore take the north-east path and check out the metal plate on the ground. It's covered with signatures and hand imprints from the Metal Gear development team.

46 - 49: Poster Girls
Poster 1: The first is inside the mansion during Act 2. Tucked away behind a painting in the reception area. Shoot the painting to reveal it!

Poster 2: Same act, same building, but this time just walk up the stairs and into the room with the bed. The poster's hanging above it.

Poster 3: This one is floating around Act 3 during the Eastern European resistance-stalking mission in the central part of Midtown.

Poster 4: Act 3, in the south sector of Midtown. It's on the wall before you leave the zone. Switch to FP and Snake will say her name.

50: Final Fight
During the final battle with Ocelot, watch as he makes his famous signature fist-clenching gesture, and then without delay immediately press and hold the triangle button to reboot Snake's life gauge. Extremely useful secret on the higher difficulty levels, this. It's a real life-saver.