Metal Gear (NES)/B2 Floor 1

Part 1
C2: When you arrive, you will be cut off from most of the room. Your only two choices are to wade into the shallow water, or take the lower path to the left. It's a good idea to take the lower path first for no other reason than to stock up on ammo and mines. Then you will return to this room and hop in the water and proceed to room C1.

C1: If you arrive via the lower path, you will have access to the left door. Use card 4 to access it, and inside, you will find ammo. Don't worry if the guards notice you, stock up on ammo until you are full for your class, then return to C2. If you arrived via the shallow water, all you can do is wade over to the middle door. This too opens with card 4 and leads to B1. For now, you will be unable to access the door on the right, even if you approach the door from the upper path.

B1: When you arrive in this narrow hallway, you will be greeted by a heavily armored bulldozer whose width matches the hallway's.

Once it is defeated, proceed through the door with card 4 to A1.

A1: You should recognize these objects as components of the infra-red laser beam security system. Just like before, you can see the beams if you wear the IR goggles. Unlike before, these beams are not static; they alternate a couple of times each second. The pattern repeats every five cycles. To maneuver safely through this room, you must time your passage through the openings created when a beam disappears. An elevator to other floors is on the opposite side of the room, but for now exit through the right to A2.

A2: This is another split room. For now, you can only access the left side. Deactivate your IR goggles, and it's not a bad idea to activate the body armor if you happen to possess it. Head down through the opening to room B2.

B2: This room is broken up into several parts as well, with a pool of water in the middle. You can safely traverse the shallow parts (indicated by the light color), but if you wade into the deep parts (indicated by the darker color), you will begin to lose health while you remain there without an oxygen tank. Since you don't have one, it's advisable that you stay out of that region. Your goal here is to cross the water and approach the door on the left with card 2. Enter the room and you will start getting a call on your transceiver. However, if you attempt to answer it, you won't receive a response. You will find an antenna on the desk. Upon collecting the antenna, you will suddenly be able to make and receive calls through your transceiver again. This item works automatically, you do not have to activate it. Big Boss will contact you to let you know that your signal had been jammed, but the problem is gone, presumably thanks to the antenna.

At this point, you can explore the remainder of the first floor, but you do not possess any access cards that will let you examine any rooms. When you're ready, return to A1, watch out for the laser beams, and head for the elevator. The elevator that you reach has an interesting quirk: it will only go up. Therefore, once you pass a floor, you can never return to it. For the time being, go all the way up to the rooftop.

Part 2
After having collected card 5 from the rooftop, return to the first floor to collect another useful item.

C3: The room you arrive in has two guards. Take them out or sneak past them, and head through the south door. You will arrive in what looks like an empty screen. However, if you are too curious and explore the room, you will trigger a pitfall along the right side of the room. Exit the room through the west door with card 5 to room C2.

C2: Follow the upper path to the west in order to reach the upper right corner of C1.

C1: Watch out for the guard and open the nearby door with card 5. Inside, you will find a room with rations that you can exit and re-enter to stock up your inventory. When you're done, exit the room, and return east to C2, then head north to B2, and immediately travel east to take the low path to B3.

B3: Watch out for the guards, and follow the path east then north to room A3.

A3: You can open the east door with card 5. Inside, you'll find a prisoner who will inform you that the water channel leads to building 3. However, without an oxygen tank, you can't take advantage of that fact. He will also inform you of the fact that the Arnold Brothers have one of the access cards, and that they can be defeated with a Rocket Launcher. Return outside, and make your way back to B2.

B2: Hop in the water, and be sure to remain in the shallow sections. Wade along the top portion of the water to the east to room B3 again, and follow the water up to A3.

A3: Exit to the left. From here, if you travel along the north path to A2, you will find the back door of building 2, but you need to defeat the Arnolds in order to open the door. Head south, and follow the rail through B3 and back to B2 (watch out for the soldier), and then finally up to A2.

A2: Finally on the right side of the railing, activate card 5 and open the east door. Inside the room, you will find access card 6.

With card 6 in your inventory, return to B2, and make your way back to the elevator behind the infra-red laser defense system in A1. Ride the elevator up to the second floor.