Objective 7: Neurotoxin Laboratory B
Make your way into the guards' room and take him out when he opens the door. Grab the health and ammo and start to make your way back out into each of the rooms you just passed through. Now you need to set explosives on each of the green toxin machines that you just added solvent too. In each room a few guards will show up. Take them out and then set the explosives on each chemical tank. When you get to the end, go out to the courtyard and clear it out of enemies. They will keep appearing all over, so just keep killing them until Ethan tells you that there are no more. Once that happens, Dr. Ivanescu will let you through the door.
Objective 8: Shipping Docks Perimeter
Grab the ammo off the table in front of you and the health on the wall. Head out to the balcony and take a look to the far left corner down below. Jasmine will be coming through that gate and will need you to blow it open. Shoot the barrels there to make them explode. Once Jasmine is through the gate, she will just crouch and hide behind things while you shoot the guards as they appear. This is pretty much like the Sofia level earlier on. When Billy swoops in to pick up Sofia, turn around quick because a guard will be coming through the door behind you.
Objective 9: Shipping Docks Interior
Now that you have a trusty new kick ass gun, make your way forward through the courtyard and into the rooms on the other side to grab more ammo health and to kill some baddies. Sit in the room and let them come to you for a bit. When no more show up, head out and make your way across the courtyard and up the stairs to the room in the corner there. Grab the health and ammo and again let the baddies come to you. Make your way out when all is quiet and Billy will show up in the chopper when you reach the ground or have taken out enough enemies. Fire the micro-cord to the bottom of the chopper and he will lift you out of there.
Mission 5: Aerial Infiltration
Objective 1: Aerial Infiltration
This part of the game can get very frustrating. What you need to do is free fall through the rectangles that appear below you as they spiral down. When you finally get to the bottom of the flight path, you will then be able to launch off with the jet pack, but getting there is hard enough. To keep in line with the rectangles, I would press up of the left stick to dive down and spin around to try and keep on track. When I was getting to far off track I would use flare, right trigger, to slow my self up when ever I was getting to far off to one side. Use left and right to keep yourself close to the path and eventually you will come to a yellow marker. When you hit it, then you can do some serious diving through the rectangles and use the flare move to stay on the path. When you hit the second yellow marker, you will be told to fire the jet pack. Face the tail of the plane and press A to take off.
When you are using the jet pack, you need to catch the plane ahead of you while they fire rockets at you. They shoot a few while you are reaching the plane which is easy enough to avoid by flying around, and then they will shoot a few more as you get really close. You can allow a few rockets to hit you, but not too many. When you are close enough to the tail of the plane, Luther will tell you to cut the pack and fly into the open door. Follow the flight path that appears in the form of blue rectangles like it did while you were diving. Try to get high enough to follow them and then flare as you get close to the open door to slow down and make it easier to control. It took me about 8 tries to finally land myself inside the back of the plane. Each time I was too low or off to one side. It really is tricky to do, but after a few times you'll get it.
Objective2: Algo's Headquarters
Pop your head around the corner and start taking out the many guards that appear from behind the crates and the catwalk above. Make your way through them to the console at the far wall and use the computer there. Hack it and Luther will tell you that you need to place explosives on the tail and wings of the plane. Climb up a ladder and you will come to the second floor that will have more ladders on each side. Each ladder will lead to a spot where you need to plant an explosive. Climb up each one and place the explosive on the red mark on the wall where the light grey boxes are. Make your way back down to the floor after each explosive and take out the guards that appear.
For the last explosive, make your way to the back of the planet, near the open door and shoot the micro cord to the yellow pipe above. Shimmy to the back of the plane and drop down to the ledge to place the last explosive. When you do, more guards will appear in the cargo bay. Turn around and take them out with the sniper pistol. When they are dead, grab the pipe and make your way back to the cargo bay and through the door behind the console at the end by pressing the white button beside the door. When you enter, there will be a guard directly in front of you. Peek your head around the corner and there will be another guard patrolling and a camera in the far corner. Take out the camera and look through it to see another guard off to the left.
What I did was tranq the guard who walks near the camera and then immediately tranq the guard in front of me and then tranq the third and final guard in the next hallway while immediately afterwards disabling the camera in that hallway so the alarm doesn't go off. It is very tricky to pull off and if you don't the place will be swarming with guards. There are three rooms here on this first floor to grab ammo and health and if you trip the alarm you are really going to need it. Make your way up the stairs and through the door at the far end of the room. Continue down the hall and through the door on the right. Make another right as you enter this hallway and follow the corridor around to another door. Enter there and press the red button on the console. Make your way back out and around the corner to the next protected door which will be unlocked now. Climb up the ladder here and grab the health kit off the wall at the top. Make your way to the door at the end of the corridor and enter it.
Objective 3: Aerial Rescue
Well at least this skydiving mission is a whole lot easier than the previous one. Simply dive towards the diamond in the center of the screen and keep spinning to avoid the missiles that are shooting towards you. You have a timer counting down which will only give you 2:30 to reach and save Sofia. When you close in on the diamond in the center, there will be a guard that is sky diving there as well. When you land on him or close to him, a scene will play and you will take his chute. Now you need to save Sofia which is just as tricky. Again, simply dive for the diamond in the center and when you reach Sofia you will need to hover over the yellow marker facing the direction the arrows are pointing until the circle gauge that appears fills up all the way around. Tap the flare button to keep your self flat and in position as it fills. Once it is all the way around, then you will have Sofia.
Objective 4: Surma Rooftop
As Algo runs into the far door, the area fills with guards. Pop your head around the left side of the box in front of you and take out the few guards there. Continue down the stairs and past the boxes until you reach a ladder going down on the right. Slide down it and go to the far wall. Take out any enemies shooting at you and then use the micro cord to reach the pipe high above you. Shimmy to the left and drop down and enter the door there. When you enter, grab the health and ammo from the small room and go through the next door. After the scene with Algo, run down the stairs on the left and hide behind the box there. Crouch down behind the left most box and shoot. Algo when he shoots at you.
From here, you will be able to hit him, but he won't be able to hit you. When you are hitting him, he will turn blue and move to another spot. Just look for the flash of his gun and fire there. After you hit him enough times he will run away. Head around the corner and hide behind the small box there and again, start shooting at him as he runs back and forth on the catwalk. After you shoot him enough times, he will run inside the door on the side. Take out the guards that appear through the two top doors and make your way up the stairs and across the catwalk to the door Algo went into.
Grab the health and ammo and enter the hallway. Go left and you will come to a room with a lot of gears spinning in the center and catwalks along each wall. Algo will be running around on these catwalks above you. Enter the door that is along the catwalk to take the stairs up to which ever floor you want to go to and grab the health kits along the way. To take out Algo, you just need to fire at him non-stop. He will move a little bit or may run off to the side a few steps but once you start firing at him he won't go far and it won't take much to kill him at all. I stayed one floor below him and fired up at him from the right side of the room. After you kill him, sit back and watch the ending to this hard, but not impossible, mission.
Congratulations!