Metal Gear Solid 3: Snake Eater

While traveling with EVA, grab her, and interrogate her. She'll tell you a code that involves directions but then she'll say that she doesn't remember the rest of it. The code EVA was talking about was the famous 30 lives cheat code from Contra on the NES.

Its the guard you see on the second floor, when you first enter Groznyj Grad Weapons Lab: East Wing. Interrogate him to get the Acid... Password... X M E I G H T.

In the Snake Eater Mission, go to compound area where the Hind sits. You'll know it's the right area because you'll see the Hind (Helicopter) grounded with noone piloting it. Interrogate the guard closest to the front door entrance of the largest building two or three times and he'll give you a password for Metal Gear Acid: V I P E R (Viper).

Much like MGS2 :Sons of liberty, you can change the background when you first start the game. Try the following:

Press R3 to change the color of the background.

Press L3 to change the pattern of the background.

Press R1 to speed up the CQC scenes.

Press R2 to slow down the CQC scenes.

Use L1 and L2 to change the color of snake and the enemy.

And press Triangle to reverse the color of snake and the enemy.

In the cave, bats attack you if you run. But if you use the active sonar and send out a 'ping', the bats will stop coming after you. That is because bats use sonar to see, they attack the strange noises snake is making and using the sonar tricks them into thinking you are just another bat.

When fighting The Fear, before you beat him, let him hit you a few times with his crossbow. The bolts will stay in your body, and you are supposed to remove them through the Cure menu. If you beat him, you will automatically be healed fully, but the bolts will still be stuck in you for the rest of the game. If you go to your Cure menu, you will see them sticking out of you, but you can't remove them. They are visible with any camo you wear, but not visible during cutscenes.

Defeat certain bosses by lowering their stamina to zero using the tranquillizer. This unlocks special camos that give you specific abiilites.

You have 4 choices:

1. Enter 144.75 as a frequency and kill the guard using the fork or punches.
2. Use the fake death pill and when the guard walks in take the revival pill and kill him.
3. When the guard gives you food, throw it out the window 2 or 3 times and he goes to use the bathroom. Take this moment to call 144.75 and kill the guard on the toilet.
4. When the guard gives you food, throw it out the window 2 or 3 times and he goes to the bathroom. Wait for him to come back and you'll have a conversation. The guard then gives you cigar gas-spray thinking they are just cigars. Make him fall asleep and call 144.75 to get out.

When you are in alert mode, grab a guard and interrogate him. He will give a radio frequency you can call to call off the alert. After the alert is over, the frequency changes.

Beat Ocelot non-lethally: Animals - Steady aim
Beat The Pain non-lethally: Hornet Stripe - Wards off insects
Beat The Fear non-lethally: Spider - Trades stealth for stamina
Beat the Fury non-lethally: Fire - Less damage from fire
Get to the end of the Sorrow - Choke people for stamina.
Beat Volgin non-lethally: Cold War - Russians will not attack