Metal Gear/B1 Floor 1

Part 1
E1: From the start, you will arrive undetected at the southwest corner of the first building. Once you swim to the crates outside of the fence, Big Boss will contact you on the Transceiver. He will give you the mission instructions: infiltrate Outer Heaven, locate Gray Fox, and destroy Metal Gear. He will tell you to contact him on frequency ''120.85'. Then you will climb up and over the fence and be on your way. Head north to D1.

D1: Upon entering this room, you will be contacted again by Big Boss. Press F4 to listen to him, and he will remind you that this is an infiltration, and you should try not to be seen. From here, head north to C1.

C1: This room is guarded by two soldiers. Soldiers cannot see you if you do not stand in their direct line of site. With no weapons, you're only means of engaging them is by punching them until they are knocked out. Whether you choose to fight them or not, head west to C2.

C2: This is the lower left corner of the courtyard. There are three trucks parked here. The left truck contains rations. Because items return when you leave a room and come back, you should visit this truck at least three times to max out your ration inventory. The middle truck contains a card and a soldier. If you enter the truck, the soldier will react and attack you. However, if you stand patiently outside to the left of the truck, the soldier will eventually exit the truck and patrol the right side. Then you can slip inside the truck and obtain card 1 undetected. The right truck contains the binoculars. These allow you to preview the four screens on either side of you.

With card 1 in your possession, it's time to retrace your steps back to D1, and head east to D2.

D2: Two soldiers patrol around either tank. They both head up the middle, and split up at the top. As they head up, you can run to the center of the room. Then head up as the patrolling soldiers head down the opposite sides, and cross over the top to the right to reach D3.

D3: This room is split in half. You can only access the left half for now. The door at the top is locked with card 1. Press F3 to activate the card, and push up against the door to open it. Inside the room, a soldier patrols above a set of crate. He is tired, and tends to fall asleep. When he does, you can easily sneak up to him and knock him out with punches. Then approach the table in the back to collect the gas mask.

Having collected the gas mask, return back to C1, and proceed north to B1.

B1: Two soldiers patrol left and right in this room. Even the lower soldier won't be able to spot you as long as you walk between the crate and the left wall. You should time your progress through the room to remain unspotted, or to ambush the soldiers before they detect you. Head north to A1.

A1: Two soldiers stand on either side of the elevator doors, behind a row of tanks. The tanks will block their view of you when you stand below them. If you wait in the room long enough, their time to guard the elevator will end, and they will head out before the replacements arrive. That is your chance to run to the elevator. However, before you do that, visit A2 to the east first.

A2: Three more trucks sit inside the room. The doors in this room are locked with a card that you don't have yet, so all you can do is explore the trucks for now. Investigate the left truck to find your first fire-arm, a handgun. Though you now have a weapon, you still do not have ammo for it yet. The middle truck contains four soldiers who will not be pleased to see you if you enter, so avoid it. The right truck contains a soldier and a set of five land mines. You can try waiting outside for the soldier to leave, or you can just take the soldier on, avoid the bullets he fires at you, and punch him out. Collect the mines and leave the truck.

Once you have gathered the handgun and land mines, return west to A1, wait for the guards to leave their post, and enter the elevator. Your only choice will be to ride the elevator up to the third floor.

Part 2
You should be returning to this floor after you have explored the third floor and gathered card 2.

A4:

Part 3
You should be returning to this floor after leaping from the roof with the parachute.

B3: