Metal Gear Solid

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Sound menu:
Complete the VR training missions with a 100% ranking. The sound menu will be unlocked at the options screen and allows all game sounds and music to be played.

Special stage select:
Successfully complete the game under the "easy" or greater difficulty setting. The special stage select allows any level to be played with new mission objectives.

IdeaSpy 2.5 CODEC sequence:
Successfully complete stages in the special stage select to get No. 4 to reveal pieces of the plot.

Successfully complete the Japanese, European, or Australian versions of the game. Start a new game and go to the CODEC screen and tune to frequency 140.07. You will be shown an IdeaSpy 2.5 episode for each stage that was completed.

Successfully complete the game, and then start a new game. Dial up 140.07 on the Codec to hear some in-game entertainment.
Information in this section was contributed by Fonda 500.

Hint: Automatic ration use:
By equipping rations as opposed to simply using them, they will automatically be used by Snake when needed. This is especially useful in Boss battles, or when there is a chance of being hit by a powerful attack.
Information in this section was contributed by Kent Phillips.

Hint: Reset enemy positions:
In most places of the game, you can reset the enemy positions by leaving the screen you are in and returning. This will "reset" the enemy positions to where they were when you first entered the area.
Information in this section was contributed by Shotgunner.

Hint: 5-7 Suppressor:
To get the Suppressor (silencer) for the 5-7, follow the guard instead of entering the fortress. He will enter a small guard post; follow him in. Once the short interaction between the two guards ends, get the box next to the guard. It contains the Suppressor. Since the guard is asleep, do not worry about him. Just get the Suppressor and leave.
Information in this section was contributed by Shotgunner.

Hint: 5-7 ammunition:
When you first get the 5-7 and the Suppressor, do not become trigger happy. While the 5-7 is silenced with the Suppressor. It is only useful while you have bullets. Use your fists instead of the 5-7 when sneaking around. Once spotted, use the 5-7 as much as you want.
Information in this section was contributed by Shotgunner.

Hint: Drainage Sewer:
You will overhear two guards talking about a squall (storm) that just arrived. Shortly after, you will see walls of water coming through the sewer. The only way to avoid being swept away is to climb the ladders that are around the area. The rock piles and sections of the wall that are big enough to hide behind are not going to protect you. You must climb the ladders.
Information in this section was contributed by Shotgunner.

Hint: R5:
Use the R5 Only when spotted, or in Boss battles. Since it does not have a Suppressor, using it while sneaking around is not a good idea. If you are spotted, use it as much as you want. Just keep an eye on the amount of ammunition you have.
Information in this section was contributed by Shotgunner.

Hint: Cardboard box (yellow):
Climb the very last ladder in the drainage sewer. The cardboard box (yellow) is in there.
Information in this section was contributed by Shotgunner.

Hint: Find Chris:
Chris says she is wearing a red hat. Remember that her hair is tied behind her. Since some guards also wear red hats, you have to look for the one with long hair. She is the only one with long hair and a red hat. Any others with red hats are obviously guards.
Information in this section was contributed by Shotgunner.

Hint: Defeating Hawk:
Your first Boss battle is against Hawk. The only way to kill him is with grenades. Since he is on a section of ground that is higher than you, your R5 and 5-7 cannot hit him and the ECM (Electronic Counter Measure) grenades only disrupt electronic devices. If you run out of grenades, there is another crate with four grenades in the bottom left corner of the Boss area.
Information in this section was contributed by Shotgunner.

Hint: Defeating Metal Gear:
At the end of the game you have to defeat Metal Gear. The first time you face him when he is walking, you will see small circles on the ground. These are the shadows of his feet. Watch them until they stop. When one of them stops, put a mine on it then run as fast as possible until he steps on it. Keep repeating this until he is dead.
Information in this section was contributed by roger baker.

Hint: Fast time trial:
If you have completed the game, go to the stage select menu. Select special mission stage 2 number 2. In this mini game, it requires you to complete the game without dying. If you die, exit the game and go to the VR training mode special. Here the guards are alert 100%, and can kill you if you do not kill them faster.
Information in this section was contributed by Francis Ranada.

Hint: Silent floor:
You will learn of the "water" floor sections while in VR training. Like the PlayStation version, if you walk on these sections of flooring, you will make noise. However, if you press Start and crawl over these floor sections, it will be 100% silent. Just make sure that a guard or camera does not see you.
Information in this section was contributed by Shotgunner.

Hint: Candid camera:
If you move anywhere in front of a camera, you will be seen. This includes crawling past and even "sliding" past with your back to the wall.
Information in this section was contributed by Shotgunner.

Hint: Cameras:
The camera are more difficult than guards. You can press up against the wall to avoid detection in the PlayStation version of the game. However, in this version you will get seen if you do this. To get past a camera, watch its movements. The camera is easily located by radar. A moving orange dot is a camera mounted on the wall. Use a cardboard box and remain still until your a camera has passed you. Use crates for cover and remain undetected. Move to each crate when the camera has passed the next crate.
Information in this section was contributed by LANSDOWNE49.

Hint: Sensors:
Always use your equipment to detect any beams guarding the next area. Thermal goggles and cigarettes could prove useful. Use them to locate the beams then pass them when the smoke disappears
Information in this section was contributed by LANSDOWNE49.

Hint: Stun grenades:
While they will stun a guard, you will also be calling the other guards' attention. They make a lot of noise, so do not use them unless absolutely necessary.
Information in this section was contributed by Shotgunner.

Hint: Birds:
When you see birds on the ground, you can be sure that there are guards or guard dogs nearby. If you make the birds fly away, the alarm goes off. If the birds stay, the guards or guard dogs will not know you are there.
Information in this section was contributed by Shotgunner.