Metal Gear Solid 4: Guns of the Patriots/Act 1: Liquid Sun

Plot
Act 1 take place in the Middle East, Morocco, to be exact. Snake has been ordered to take out Liquid to stop him from hactching his plan, but he must first make contact with a U.S. Army recon team, RAT PT 01(Rat Patrol Team 01), to assertaine Liquid's location. Along the way, he must deal with the war between the Praying Mantis PMC Soldiers and City Militiamen.

Middle East: Ground Zero
After the opening cutscene, you'll be given brief control of Snake. Crawl under the truck parked by the low wall to get a Ration then crawl under the other truck to trigger another cutscene. After that, pick up the AK-102 and the other dropped rifles to obtain some Ammo, then either go back up the road you just came down, or go up the NW road, it doesn't matter which, once you get to the end of either road, another cutscene takes place.

The cutscene introduces you to a new enemy: Gekko.The means to take out this enemy are not at your disposal, so run! Head into the building with the missing wall to the SW to get out of the street, and move from cover to cover to avoid the Gekko. If you are spotted however, don't worry about an Alert going off, it won't. Go North to the blip on your radar to trigger yet another cutscene.

Middle East: Red Zone-NW Sector
After all the cutscenes are done, shake down(pick up and then put back down)the bodies of the dead Militiamen to obtain Items and Ammo, then head through the alleyway. In between two buildings across from you are Petrol Bombs, cross the street and grab them. A PMC Stryker will arrive to drop off a squad of PMC Soldiers and gun down a small group of Militiamen. Cross the street and go through the doorway and collect the items inside. You can shake down the trio of Militiamen in the small room if you want, but be careful so that the PMC Soldiers don't see you.

Crawl under the pile of rubble to see a Militiaman get gunned down by a PMC Soldier after begging for his life. Wait until the PMC Soldier moves away then sneak up behind him to hold him up, grab him and slit his throat, or just throw him to the ground to get rid of him. Move through the building and open the lockers to obtain a Regain, then move to the doorway and wait for the pair of PMC Soldiers to move down the street before moving across and into the next area.

Middle East: Red Zone
In the next area go underneath the stairs to obtain a Cardboard Box then head up the stairs and Dive-Roll over the gap to get into the small room. A single PMC Soldier is here. Wait for him to turn his back and dispatch him, then head down the next flight of stairs and search the lockers for Items and move through the doorway. Watch the PMC Soldiers' patrol route and when he turns his back, either sneak up and take him out, or sneak by him and climb the ladder and crawl on the floor to get around him. When you're near the blip on your radar, hide behind the dumpster until a pair of PMC Soldiers move through the area and move away. Once they're gone, enter the building to trigger another cutscene and get some new toys.

Middle East: Red Zone (Warzone)
Note: ''The area you're in now has become a Warzone with Militiamen fighting against PMC Soldiers. In this area, and from now on in all areas like this, two guides will be presented, a Lethal and Non-Lethal way through each area.''
 * Lethal Walkthrough: Start out by climbing the ladder in front of you and walking around the remnants of the floor to a rubble-bridge and cross it. Go left and peek around the corner and you will see two PMC Soldiers moving to engage the Militiamen below. If you don't care about an Alert going off, take them out with your AK-102, if you do care about Alerts, then wait until they take positions and start firing on the Militiamen, then come up behind them, grab them, and slit their throats one at a time, then shake down their bodies for supplies. Retrace your steps and exit out onto the street, turn left, and you will see a squad of PMC Soldiers firing on the Militiamen. If you have grenades, throw one to take them out, but one of them usually survives the blast, so be ready to do the old, sneak, grab, and slit to make sure he stays down. Go around through the building with the pile of rubble near the door, and get down behind one of the sandbag barriers. You'll have no doubt by now noticed the PMC Stryker firing on the Militiamen. There's an RPG-7 near the pillars of the building to your right, so run up and grab it, then fire at the Stryker to take it out in one shot. After you take out the Stryker, the remaining PMC forces will begin to fall back, and the Militiamen will pursue them. The Militiamen usually take out the remaining PMC Soldiers on their own, but get gunned down by another PMC Stryker. Sorry to say it, but there is nothing you can do here since you already fired your only RPG round, and no Ammo for it is available in this area. Head back to the building where you found the RPG, and go through the doorway.
 * Non-Lethal Walkthrough: Head out onto the street and look left to see a squad of PMC Soldiers firing on the Militiamen. You can get past them as long as you crawl, and once you're past them, go through the building with the pile of rubble near the door. The Militiamen won't shoot you, but they will be grateful if you help them. If you want, use your Tranq. Gun to knock out some of the PMC Soldiers, making it easier for you to move. Grab the RPG if you want it, then go through the doorway.

Militia Safehouse
Be sure you are wearing the Solid Eye in this area, there are a lot of items to pick up. Head down the hallway and enter the room with the lone Militiaman. He won't attack you as long as you haven't killed any other Militiamen, so just walk by him. Keep moving through the Safehouse, picking up any items you see as you go. At certain times, a Militiaman will tell some other Militiamen to get ready to move out, then they will all move down the hallway, and out of the Safehouse. Stay out of their way and let them go. You will soon come to a makeshift hospital with many wounded Militiamen. One of the Militiamen will start talking about a group of "freaks" who, "don't move like humans, more like...beasts". Wait until he finishes talking before you leave the hospital, and continue through the Safehouse. You will then come to an map room, where two Militiamen are talking about UCAVs, snipers, and enemy movement. Wait until they finish talking, then call Otacon. Once the conversation is finished move through the Safehouse further, and listen to a Militiaman talk about ID Locks on weapons, and how he has one himself. Call Otacon, then use your Solid Eye to find the Militiaman with the gun, then use your Tranq. Gun to knock him out, and take his weapon. And don't forget to check the room to the East of the room where you knocked out the Militiaman to find RPG Ammo and a Militiaman Disguise. Continue through the Safehouse, and head up the stairway to trigger a cutscene, and meet your new best friend.

Urban Ruins
Go south of your starting position to find an RPG, then head up the stairs and grab the Items there, in including a Red Dot Sight for your new M4. Hang off the ledge/floor and drop down to get another RPG, then proceed through the crumbling building. You'll soon come to an area where two Militiamen will be saying that they can take out the enemy from where they are, but end up getting shot themselves. Grab their rifles, and keep moving through the building. When you come to the area where the staircase collapses, go left and climb over the rubble, then shimmy across the wall and drop down to trigger a cutscene.

Urban Ruins(Warzone)

 * Lethal Walkthrough: After the cutscene, head back into the building to grab some Items, and be sure to check behind the collapsed stairs to find a Handgun Flashlight. Go outside and move down the road. There are PMC Soldiers behind the sandbags not too far ahead, so use a Grenade or the nearby Mortar to take them out. Soon a Stryker will arrive to heat things up. Use your RPG to take it out, and mop up any surviving PMC Soldiers. Once the battle is over, collect any dropped weapons, and head down the alley near the white car. When you get about halfway down the alley, you'll see a few Militiamen moving West. Get out of the alley, collect the Items near the gate, and move through the market towards the archway. When you get to the archway you'll see some Militiamen try to move through the area ahead, but get gunned down before they're even 1/3 of the way through. Otacon will tell you that the area is covered by PMC Snipers, and that it might be a good idea too find a way around the area. Go West, and soon you'll see some crates. Climb over them, and then move through the alley until you come up on the West side of the building housing the Snipers. Use a Grenade to take out the PMC Soldiers behind the sandbags, and enter the building. Enter the room on the ground floor. Send the Mk. II upstairs to the third floor to listen to a PMC Soldier tell a Sniper to stay put while he goes down to the bottom floor to take out the Militiamen. Wait for him to enter, and take him out. Head upstairs and take out the Sniper. Grab his Rifle, and look out of the far window, and you'll see another Sniper. Take him out, and check the lockers for Items and Ammo, then climb through the window where you took out the second Sniper, and start climbing down the nearby buildings. Once you're on the ground again, move slowly up to the right side of the blue van. Soon two PMC Soldiers will move down the alley, stop at the corner of a building and move onto the street. Keep moving up and soon another two PMC Soldiers will move down the alley, stop at the corner of a building and move onto the street. Stand up and run down the alley, and you'll soon hear the gunshots of sniper rifles. Go prone and crawl through the area so you won't be spotted, and you soon come to an area where a PMC Helicopter is doing an air strike on the Militiamen nearby. Use a Smoke Grenade to blind the nearby PMC Soldiers, and get out of the trench. When the Helicopter is stationary, use an RPG to make it move away, and enter the large building.
 * Non-Lethal Walkthrough: After the cutscene, head back into the building to grab some Items, and be sure to check behind the collapsed stairs to find a Handgun Flashlight. Go outside and move down the road. Head down the alley near the white car. When you get about halfway down the alley, you'll see a few Militiamen moving West. Get out of the alley, collect the Items near the gate, and move through the market towards the archway. When you get to the archway you'll see some Militiamen try to move through the area ahead, but get gunned down before they're even 1/3 of the way through. Otacon will tell you that the area is covered by PMC Snipers, and that it might be a good idea too find a way around the area. Go West, and soon you'll see some crates. Climb over them, and then move through the alley until you come up on the West side of the building housing the Snipers. Use your Tranq. Gun to knock out the PMC Soldiers behind the sandbags, and enter the building. Send the Mk. II upstairs to the third floor to listen to a PMC Soldier tell a Sniper to stay put while he goes down to the bottom floor to take out the Militiamen. Wait for him to enter, and knock him out, then head upstairs. Either use a Stun Grenade to take out the Sniper, or send in the Mk. II and shock him to knock him out, and grab his rifle and knock out the other Sniper outside of the far window. Check the lockers for Items and Ammo, then climb through the window where you took out the second Sniper, and start climbing down the nearby buildings. Once you're on the ground again, move slowly up to the right side of the blue van. Soon two PMC Soldiers will move down the alley, stop at the corner of a building and move onto the street. Keep moving up and soon another two PMC Soldiers will move down the alley, stop at the corner of a building and move onto the street. Stand up and run down the alley, and you'll soon hear the gunshots of sniper rifles. Go prone and crawl through the area so you won't be spotted, and you soon come to an area where a PMC Helicopter is doing an air strike on the Militiamen nearby. Stay prone and crawl towards the door on the West side of the large building.

Advent Palace
This building is full of Claymores and SG Mines, so be careful. You can see them a lot better if you use the Solid Eyes' NV Mode. Crawl over the mines, or use the Mk. II to pick them up and collect them. The laser trap on the second floor is impassible at this time, so just keep going up the stairs until you reach the marker on the radar. Once you reach the marker, a cutscene takes place.

Advent Palace-FROGS
Liquid's elite troops are assaulting the building you and Meryl's team are in. There is no real strategy in the fight, just don't shoot anyone on Meryl's team by accident, make your shots count, and take cover. When Akiba disarms the lasers, dive-roll over the hole and pick up the Items and Ammo there, including a GP30, a grenade launcher for the AK-102 and AN-74. Note: If you want to obtain the Solar Gun, be sure not to kill any FROGS.

Advent Palace Garage
After the cutscene, pick up the three P90's on the ground, and a FROG statue if you managed not to kill any FROGS, and exit through the hole in the wall.

Crescent Meridian
Move through the alleyway until you see some Militiamen move West. Move out of the alleyway to trigger a short cutscene.

Crescent Meridian(Warzone)

 * Lethal Walkthrough: The Militiamen have brought in a BMP3 to push back the PMC Soldiers. Use it as cover when you move down the road, but it will eventually be destroyed by a PMC Javelin, and it rolls back when it gets hit, so don't be right behind it when it does. You can stop it from being destroyed so early by moving ahead of the BMP3, and taking out the PMC Soldier with the Javelin before he fires. Then the BMP3 can move safely. There's a PMC Sniper on the roof of a tall building, so be sure to take him out. There's a ladder on the building the Sniper is on that you can climb up if you want his rifle. There's also a Javelin here too, pick it up as well. Give the Militiamen some sniper cover and they will overwhelm the PMC Soldiers, and claim the area as their own, letting you move freely. Collect any dropped weapons and any Items you see, and either climb the ladder to the North, or head over to the group of Militiamen, to leave the area and watch an unsettling cutscene.
 * Non-Lethal Walkthrough: The Militiamen have brought in a BMP3 to push back the PMC Soldiers. Use it as cover when you move down the road, but it will eventually be destroyed by a PMC Javelin, and it rolls back when it gets hit, so don't be right behind it when it does. You can stop it from being destroyed so early by moving ahead of the BMP3, and knocking out the PMC Soldier with the Javelin with your Tranq. Gun before he fires. Then the BMP3 can move safely. There's a PMC Sniper on the roof of a tall building, so be sure to knock him out. There's a ladder on the building the Sniper is on that you can climb up if you want his rifle. There's also a Javelin here too, pick it up as well. Give the Militiamen some sniper cover with the Mosin-Nagant, if you bought it, and they will overwhelm the PMC Soldiers, and claim the area as their own, letting you move freely. Collect any dropped weapons and any Items you see, and either climb the ladder to the North, or head over to the group of Militiamen, to leave the area and watch an unsettling cutscene.

Millenium Park
After the cutscene, shakedown the bodies of the dead Militiamen and collect their weapons, then hide behind the overturned bulldozer. Two PMC Soldiers patrol right past the bulldozer. Take them out or let them pass, make your choice, and move up the road. There's a single PMC Soldier behind the barbed wire, take care of him, and go through the hole in the wall of the building just ahead. Send the Mk. II up the stairs in Stealth Mode and shock the PMC Soldier to knock him out, then head upstairs. Drop down through the hole in the floor and open the red door. Check the lockers for supplies, including a Silencer for your M4. Take care of the two patrolling PMC Soldiers outside, and then go through the hole in the concrete wall. Be careful moving through this area, there is a lookout in a tower to the West, so be sure you take him out along with the other PMC Soldiers in the area. Go through the door to the North to trigger another cutscene, and end Act 1.