Metal Gear Solid 3 secrets

Using snakes as weapons
Tranquilising a poisonous snake traps it in a cage. You can then add it to your selection of weapons. When it's selected throw it at a guard, they will get bitten and die.

Guards
Blowing up certain buildings in an area using TNT affects the guards in that area.

Making them hungry
To make the Guards hungry demolish the food stores. The Guards will then start complaining about how hungry they are, making them easier to find. They can be distracted with food That you throw out. You can even throw out poisoned food to kill them when they eat it.

Reducing their ammo
Ammo dumps can also be demolished. The effect that this has is that guards only have a very limited supply of Ammo. First they will use their rifle, then their pistol and then once both of those are used up will attack you with a knife.

Avoiding the Battle with The End
When the cutscene at the warehouse finishes you will have a short amount of time to shoot him. However doing this means that he gets replaced by an Ocelot unit.

Beating The End early
When you get to the forest that The End is hiding in. Save the game and come back to it in a week (or set the PlayStation 2 clock forward a week) a cutscene will begin with Snake sneaking up on The End dead from having to wait so long.

Mosin-Nagant
To get The Ends Sniper Rifle you have to defeat him using only tranquiliser guns.

Moss Camouflage
Unlike the other bosses where you recieve the camouflage after you beat them, To get the Moss Camouflage you have hold up The End until he gives it to you. It often reached a Stealth Rating of 100% in this area

The Sorrow
It's not obvious how to win this "boss battle" without dying first. Actually it's not that hard, all you have to do is use the revival pill when you do die (if you wanna die early use the fake death pill).

Radio Frequency
This can be obtained in a few ways
 * during the torture scene if you press R1 you will see the sorrow holding up a sign containing the frequency
 * if you throw the food back to the guard three times a cutscene will happen. Press R1 and you will see the code on the back of the photograph.

Other Methods

 * In the Cure screen spin snake around and when you return to the game he will puke, the guard will open the door to invesigate and snake can use the opertunity to attack.
 * Use the Fake Death pill obtained by removing the bullet The Boss shot you with using the Fork.

Guy Savage Minigame
Go to sleep (save) in the prison cell. When you load the file, you'll get to play the Guy Savage Minigame, which is appearently Snake's nightmare! Afterwards, call SigInt so he can share his worst nightmare.

Prison door code
during the torture scene there is an R1 cutscene. The Sorrow will be in the background holding a sign with the door code on it.

Transmitter
If you leave the transmitter in snakes back when you leave the cell. When you recover from the battle with the sorrow there will be an ocelot unit in the forest. This will trigger a hilarious cutscene where Eva takes the transmitter out for you.

Last view of Ocelot
During the award ceremony with the President. If you press R1 and look at the window you will see Ocelot looking on.