1) Open the elevator and inch around the left corner of the elevator until you can see a drone gun in the corner. Shoot it.
2) Run out of the elevator and turn left. You will see a guard. Kill him and two more will come. Kill them.
3) Go to the wall to the left of the elevator. Turn right and you will see another remote gun. Shoot it.
4) Go out and pick up the guards ammo. Then turn to your right and you will see a recess in the wall. If you look up above that recess you will see another drone gun. Shoot it.
5) Run out a little farther and turn right. You will see a guy in the back corner. Shoot him and a guy you couldn't see will come out. Shoot him, too.
6) Run into the corner where Natalya runs and there will be a guy there. Shoot him.
7) Run back to the elevator and get Natalya.
8) Run back to where she types on that computer. You have to watch her or else the door will never open.
9) When she gets the door open run in and duck. You will see two guys at the end of the hall down a flight of stairs. Shoot them.
10) Then go down a little farther and you will see the hallway turn to your right. There are four guys in there and they love to throw gernades at you so watch out. Get to the left of the hallway and inch along until you see the first guy. Shoot him and repeat this until all 4 guys are dead.
11) Run down the stairs and get the two guys ammo and the remote mines. Run up the stairs and turn left. Get the guys ammo and then go straight ahead.
12) You will see a guy in a narrow hallway that leads to a big room. Shoot him and then run a little farther into the hallway, but don't go into the room. You will see a guy right infront of you running at you. Shoot him and two guys will come from the right. Shoot them.
13) Go out of the narrow hallway and turn right. Go up the stairs and open the door and stay at an angle so you can shoot the guy who is on the left side of the door. As soon as the door opens shoot the guy to the left of the door. Three guys will come. Let them come to you and kill them.
14) Go into the room down the stairs and turn left. Open the door and walk in. Run up to the mainframes that Boris is between and put a remote mine on them. Just ignore Boris. Once he takes off up the stairs run to a safe spot away from the mainframes and blow up the two mines you just placed. This should kill the two guards that are on the second floor.
15) Then open the door that is across from the door you used to enter this room. Back up and go a little to your right. Shoot the four guards in the room and then shoot the drone gun on the right. Then the one on the left in the back of the room. Instead of shooting the two drone guns just run into the room holding your joystick forward and your left strafe button down. This should get you away from the drone guns without a scratch. Just make sure you go straight and not to your left.
16) Once you get past the two drone guns go to the main frame and place a bomb on it. Then run out. Just run straight at the door and you won't get hit.
17) Run up to the third floor and get the vest.
18) Run down to the second floor and go to the side that Natalya isn't on and place a bomb on the mainframe.
19) Run over to the mainframe on the other side and put a bomb on it.
20) Run and get Natalya.
21) As soon as Natalya says, "Coming James." run down into the room with the projection screen and the six desks. Shoot all the desks except for the one that she uses to mess up the satellite. When the alarm trips turn 180û and look at one set of stairs make sure no one is there. Then turn 180û again and look at the other set of stairs. If you see someone coming down them shoot them and then check the other stairs. If you here glass breaking which you most likely will turn and look behind each set of stairs for a guy neeling, aiming at Natalya. Shoot him and then go back to checking the stairs, but now aid in checking the broken glass. If you hear broken glass again you will know which glass it is. Turn and shoot the guy. Go back to doing what you where doing but now you have two sets of stairs and two broken glasses. After she is done follow her up the stairs and down the other set of stairs. Go back down into the area with the desks and go out one of the broken glass areas.
22) Run to the door next to the door with the two drone guns. Open the door and shoot the guys straight infront of you. Go in and turn left. Shoot the guy there. Then put a bomb on the glass surrounding the mainframe. Turn on your gun and open the other door. Shoot the guy and then turn on your detonator. Blow the mines you set. Then switch to your gun. The whole time you doing this your running for the exit.
23) Run toward the exit and shoot anyone who gets in your way. Zig zag so they can't shoot you. Then jump in the elevator.