Guide written by [http://www.mahalo.com/member/Markb Mark Burnham]
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Act 4 - Mission Briefing
TIP: Remember, as always, to take control of the Mk. II (though it's the Mk. III now) when the view switches to split-screen, and navigate it around the area to find hidden items. On the ground floor, find a Regain and some Ammunition. Remember to bump into Sunny to get the Cyborg Raiden FaceCamo Closed.
On the top floor, find a hidden iPod tune, "Lunar Knights" main theme. Also, find a Battery.
Act 4 - Shadow Moses Island Heliport
When you regain control of Snake, the graphics will have switched to the Metal Gear Solid style from the 1998PlayStation original. All you have is a scope, cigs, rations and no items.
Head to the right (east), to the side of the box-shaped area. Pause to avoid the panning search lights, and then run in to retrieve the item in the middle of the area. When ready, run across and acquire 3 Chaff Grenades.
Run straight across and into the a side-room. Throw a chaff grenade in the room to temporarily disable the security camera. Inside, you'll find three Stun Grenades.
Head back out, and turn left, heading north. There are patrolling enemies up on the north side of the area. Wait for the first one to head to the right on his route, and then come up right behind him and press Square repeatedly to choke him out.
TIP: You can hide in the back of the truck in the northwest section of the area.
When ready, crawl east. Hug the topmost wall, and you'll pass right under the security camera. Once you're past it, head up the stairs, and up onto the second level.
Pause at the top of the steps to avoid the patrolling enemy. You can go to the right, hide behind the corner there, and wait for the soldier to be walking the other way. When he is, run up behind him (the enemies can't hear you run in the old MGS), and repeatedly tap Square to take him out.
Crawl through the crawlspace in the center of the walkway. This will end Snake's dream-sequence. You will have acquired the Snake's MGS1 FaceCamo.
Act 4 - Shadow Moses Snowfield
When you regain control of Snake, you'll be in the middle of a snowfield, as the area is aptly titled.
To see way, way better, equip your Night Vision Goggles. To the east of your starting position, find to Ammunition containers. To the south against the hillside, find more Ammunition.
When ready, head west through the pathway. There are patrolling Gekkos in the area ahead. Go straight ahead, past a large rock to the right to find more Ammuntion.
Your goal is due-west. Make sure to avoid the Gekkos at all costs. Go through the path ahead to the next area, the Shadow Moses Heliport.
Act 4 - Heliport
You'll notice a song has started to play, "The Best is Yet to Come."
TIP: If you head towards the large building, look up at the security camera on the right hand side. You'll get the chance to trigger some secret flashbacks with X.
In the middle of the Heliport you'll find some Chaff Grenades.
Head into the side-room to the left of the heliport, and look up at the other camera. This will give you 1000 DP.
In the next room on that side, with a slim door, find an RPG-7. In this room on the left, crawl through the crawlspace on the left. In the next room over you'll find a Stun Grenade, and a Ration.
Underneath the tanker in front of the door to the Tank Hangar, find an Mk. 23 automatic pistol.
Act 4 - Tank Hangar
You can throw a Chaff Grenade into the main building from the ground floor, which will temporarily disable the Dwarf Gekkos in the Tank Hangar.
Once in the hangar, you'll need to deal with all of the Dwarf Gekkos. Technically you can just sneak right past them if you're careful. Their laser-sight is easy to avoid if you're careful. They have moderate hearing, though, so be careful.
Once in the hangar, make a right, and find a crawlspace. Go through it. Go past the first turn to the left, and take a left to find some Noodles. Go back out into the Tank Hangar.
Once back in the hangar, make a break for the stairs on the other side of the room, and take them up to the right.
Make your way to the room in the top right. Inside you'll find a bunch of Ammunition.
TIP: If you are in the mood, you can destroy some of the Dwarf Gekkos. Each time you do so you'll be awarded 50 DP. Beware that their death explosions hurt Snake.
When ready, head back out of the Tank Hangar, go up the stairs, and go through the crawlspace into the building. Follow it. In the crawlspace you'll find the hidden iPod tune "Warhead Storage."
When you come out on the other side, you'll need to drop down from the broken vent.
Head back into the Tank Hangar, and crawl under the north door. You'll need to sneak past the Dwarf Gekkos laser sighting. Wait until they are all pointing at the walls, and then make a break for it.
Act 4 - Canyon
Head west to the far wall, and find the Ration. When ready, continue north. Be careful of the hiding Gekko in this area. Use the rocks for cover, and make a break for the far door when ready. To the right side of the door, near the pipes, you can crawl through and get a Ration and some Ammunition.
Head inside the building.
Act 4 - Nuclear Warhead Storage Building 1F
Head up the stairs on the left, and find a Ration at the end of the walkway.
When ready, crawl through the doorway into the next room. You'll get a call from Otacon.
There are a bunch of items in this room, various Ammunition, like 5.56 x 44 mm in the middle of the room between the missiles and other varieties. Search a bit to find them. There are no enemies in this area, so explore it at your leisure.
Otacon will call again. The door is locked. He will give you a password, 48273.
Head to the north door on the second level, and use the panel to go through it.
Take the elevator down to B2.
Act 4 - Nuclear Warhead Storage Building B2
Head to the right, picking up any items you find as you go.
Make a left into the next room and head south. You'll find some Ammunition in this room, and Otacon will call. There are some cool references to MGS1 during their conversation.
When the call ends, continue south. At the back wall find the hidden iPod tune "Metal Gear 20 Years History (Part 2)."
When ready, crawl under the desk in the lower east side of the room, and continue down the hallway.
Go down the hall into the room to the north, and trigger a cutscene. You'll need to enter that password, 48273. During the ensuing cutscene, make sure you follow the on-screen prompts to trigger all of the flashbacks, pressing X.
When you regain control of Snake, find a Playboy right in the middle of the office, and also various items scattered throughout.
Head back to the exit, and encounter a Gekko. You'll need to find a way around it.
TIP: Recall what Otacon said before, about the electric floor. He said it wouldn't be an issue, as long as you didn't turn the electric floor back on. However, now you have a legitimate reason to: eliminating the Gekko. Take control of the Mk. III, camouflage it, and navigate it into the room with the Gekko. You can find the smashed control panel for the electric floor on the far end of the room, near the door. Push Triangle to have the Mk. III switch the floor back on. Watch the cool animation of the Gekko getting fried.
When ready, head back to the elevator. Take it up back up to the first floor.
Act 4 - Nuclear Warhead Storage Building 1F (pt. 2)
Follow Otacon's directions. Take the stairs down and go the north door. When you arrive, the Mk. III will open the door. Before it can do so, a Gekko will enter the room. You'll need to distract the Gekko so the Mk. III can open the door.
TIP: Here is one process to gun down the Gekko, though you'll expend quite a few bullets. Use the M4 Custom machine gun on its legs. This will bring it down on its knees. Then aim for the radar-looking device on the left of its head. It will eventually shatter. When this is accomplished, you'll need to aim for the ball-shaped device on the top if its head. This will eventually cause the Gekko to explode.
NOTE: You can backtrack through the storage building, through the canyon snowfield (collect the ammo in the field), and go back to the Tank Hangar. Go up to the second level (watch out for the Dwarf Gekko) to the shut door on the south side. Find the hidden iPod tune "Beyond the Bounds" from Zone of the Enders, and Suppressors for the M4.
Head east straight ahead on the snowy platform and collect the Ammunition. To the left find more Ammunition before entering the Snowfield. Right as you enter the snowfield, enter the room off to left with an automatic door. Collect the items inside, and continue into the snowfield, triggering a cutscene.
Act 4 BOSS: Crying Wolf
Crying Wolf is a mechanized wolf-like Beast. She will charge at Snake, throw grenades and fire her Rail Gun. She can be very fast and seemingly appear out of nowhere. To make matters worse, the area is crawling with Haven Soldiers. Here are a few techniques we used to take her down.
When the battle starts, find the ration underneath the tank right in front of you. Take a moment to use the Mosin-Nagant to snipe out a few PMCs from a distance while underneath the tank. In general, take your time during this boss fight.
You'll need Night Vision activated in order to see through the snow storm.
Crying Wolf's Attacks: At close range, Crying Wolf will tackle Snake and cause major damage. Stay far away from her most of the time. Also, she can fire grenades at you. Finally, she arms a large Rail Gun that she will fire if she spots you. If the camera switches to first-person view from the point of the view of Crying Wolf, she is about to charge you. Dodge/roll out of the way. If you successfully dodge, you'll have a couple seconds to get in a good shot or two. At the same time, don't be afraid to get in Crying Wolf's face. You can easily dodge/roll out of the way when she charges you, and then reset for another shot. It's her Rail Gun that can be a problem. With the Night Vision Goggles enabled, aim directly for Crying Wolf's glowing white area on her body (her head). This is the only place she can take damage.
After an encounter with her, watch carefully to see which way she runs. Head that way to track her again.
Spot crying wolf from a distance, and quickly hit her with the Mosin-Nagant. One shot alone knocks off nearly a quarter of her Psyche.
You can climb on top of the towers on either side of the snowfield. This isn't necessarily a good place to snipe Crying Wolf, but you can find a few good items up there.
Stay crawling as long as possible. This is the best way to spot her from afar, and hit her a couple times before she runs away.
You can find a Five-Seven Pistol on the Haven Soldiers.
Stay away from the PMCs as much as possible. Triggering a unneeded alarm won't help you. If it's completely necessary, snipe the Haven Soldiers making your life difficult. Otherwise focus on Crying Wolf, and she'll go down soon enough.
TIP: Remember to grab the Crying Wolf Doll in the snowfield, if you killed Crying Wolf with all non-lethal attacks. You can find the item on the far north side of the map, against the wall.
Crying Beauty is, like her predecessors, a very easy fight. Stay about 10-15 feet away from her at all times and continually shoot her. She will occasionally dodge your attacks, but will go down soon enough.
At the end of the fight, you'll get the Crying Wolf FaceCamo if you took Crying Wolf down using non-lethal attacks.
Invariably, you will receive the large Rail Gun she was manning.
Act 4 - Blast Furnace and Casting Facility
Go through the door and trigger a call from Otacon.
When it ends, you'll be in the Blast Furnace.
Take a second to head down the catwalks up on the top level area and collect all of the items.
If the Dwarf Gekkos get it in the way, you can take a shortcut past them and jump over the railing down to a lower level. Use this technique to go around them when they block the path.
Turn left from the entrance, and go all the way to the far side. Walk along the ledge there to the right to the get to the next area. Follow the catwalk to the end. Drop all the way down on the left-hand side to ground level. Walk up to the panel and trigger it. The elevator will take a couple seconds to arrive.
NOTE: You can always backtrack to the previous area to reset the alarm, if it gets out of hand.
Act 4 - Blast Furnace PT. 2
When the elevator door opens, there will be a Gekko right in front of you. Obviously, you'll need to avoid it.
Wait until the Gekko has its back turned, and then make a crouching break for it along the west wall. If you dare to head to the right and collect the items there, it can be done.
Act 4 - Casting Facility North
Creep forward along the west wall. Use the large machinery in the area for crouched cover from the patrolling Dwarf Gekkos. Wait until they are scanning an area pointing away from you, and then head forward across the room. Enter the north door. You'll need to jump up over the conveyor belt, running past the Gekko to your right, and make a break for it.
Once you enter the north door, go down the ladder on the right and find some Ammunition.
Go through the door when you're ready to the next objective marker, and a new area.
Act 4 Underground Base
Head forward, and collect the Ammunition at the foot of the stairs. Go through the crawlspace at your feet. Otacon will call you.
You'll need to get past the Drawf Gekko patrolling the room ahead. If you fall into the trap doors in the floor ahead, you will instantly die.
When the Gekko moves behind the corner to the right, crouch up behind the corner. Wait for it to move forward across the steps. When it does, move slowly across the steps, and then immediately to the right. Go up the steps to the top floor (there are a bunch of items up there: Noodles, Ammunition, RPG-7, etc.). Wait until the Gekko moves back down the stairs to the left, and then move back to the foot of the steps. Wait until the second Gekko on the ceiling disengages its search beam near the exit, and then make a crouched break for the door on the right.
Enter the door at the end of the hall to trigger a cutscene, and a boss fight against Vamp.
Act 4 BOSS: Vamp
Vamp is an extremely powerful, vampire-like enemy. His CQC tactics are very threatening, and he has one especially confusing ability (which we'll get to). Here are a few techniques we used to take Vamp down.
Vamp's Attacks: He will jump all around the map, doing flips and other acrobatic moves, a spin/dance kick that causes major damage, throws heat-seeking knives, does close-quarters knife stabs and in general is very difficult to shoot.
We used the M4 Custom machine gun, which worked pretty well. When he stops moving, shoot him and cause as much damage as possible.
Stay far away from him at all times, and keep running around the map.
If you can keep him at a distance, he won't be much of a immediate threat.
When he's rushing right at you, fire continuously with the machine gun and dodge out of the way when he's about five feet away. He will then usually reset.
Don't stay directly in his line of sight for too long. He will throw knives at you, sometimes two at a time.
TIP: When you deplete all of his life, he will stay down for about five seconds, and then he will rise again and completely regain his life. We admit, this was pretty confusing on our first playthrough. We took him down again, this time depleting his Psyche with the Mosin-Nagant, with the same results. We then took him down yet again, using the M4. Again, he rose. Otacon exclaimed something about "what are we going to do?" We don't know, Otacon. That's what you're for. Through all of this, we got rather good at dodging his CQC attacks.
After exhausting nearly every weapon in our arsenal, including the Rail Gun, the Mosin-Nagant, the M4, the RPG-7, depleting all of his Psyche and his health at once (or trying to...), we decided to try something unorthodox: the Syringe. This, actually, is how you kill him.
TIP/SPOILER: Quickly drain Vamp's health. When he falls, equip the Syringe. When he rises he will be temporarily vulnerable as he regenerates. Come up behind him, press R1 to grab him from behind, and then Triangle to inject him with the Syringe.
When the cutscene ends, you'll need to destroy all the Gekkos in the room, while Raiden fights it out with Vamp in split-screen.
Use the Rail Gun on the Gekko's legs first. When they drop down onto their knees, fire straight at their head continuously. You might have to do this a couple of times, but they'll eventually fall. Ideally, aim right for the underside of their necks with the Rail Gun.
TIP: You can zoom in using Triangle, and aim three well-placed shots with the Rail Gun right at their heads, and this will take them immediately down.
When they have all been eliminated, this will end this section. Watch the cutscene.