Chapter Three: Blowing Up
Escape the exploding building! Exit the room quickly. Go around to the right. You'll spot a guard ahead (or more likely, he'll spot you). He'll explode soon enough so stay back. Go through the hole in the wall and shoot the ammunition in front of the crack to create another exit.
Hop outside and cross the girders to the left. Stay on the girders; it's tough to leap to the left and make it to the opening. Go around the far side and into the opening. Head down the hall on the right. Drop down at the end of the hall, turn around, and continue onward. Two guards are posted at the far end; they're standing near explosive barrels, so shoot the barrels if possible.
Go through the door into the next hall. A single foe patrols here. Use the table as cover and blast him. Continue until you reach the double doors on your left. Many enemies are inside so be prepared. Shoot the red barrel if possible or lure them toward your position. Exploding the red barrel should eliminate them all. Comb the room for ammo and painkillers.
Look down the hole and shoot some explosives. Drop down and finish off the remaining enemies. Drop down another hole and go to the double doors. Go to the right and make a mad dash through the fire. Go to the left at the opening and then go through the center until Max makes it out.
Chapter Four: Routing Her Synapses
You now assume the role of Mona in a mission that takes place at the same time as Max's previous missions in this same building. Cross the area to the left. Start up the staircase with caution as there is an enemy waiting on the next flight.
Proceed through the doorway that lies on your left. Watch out for the enemies above. Duck behind the wall on the left and pull out Mona's sniper rifle and eliminate the first one. When you run across the room, turn around and take out the second.
Start up the scaffolding. When you can emerge onto the floor, do so and take out the enemy across the way by shooting the red barrel. Gather any ammunition and continue up the scaffolding. There are more guards near the top. The explosion should lure them down. Hide behind the opening and take them out as they emerge down. Go to the very top and battle the enemy near the lift.
Use the lift to descend a floor. Grab the painkillers to the right. Continue onward to the marked door. There are lots of enemies in this area. Go off to the left and wait for them to pursue and ambush them. Take out the enemies at longer range with a desert eagle or her sniper rifle. Search the area for ammo and weapons (including the MP5). Go to the right and find the opening.
You'll discover plentiful enemies on this scaffolding. Lure them down the steps. Stand behind the crates to the left and blast them with the desert eagle as they round the corner. Finish off any remaining guards at long-range with the MP5 and bullet time. Ascend the scaffolding until you reach its peak.
There are three enemies around the right corner. Stay at your location and lure them from out of their cover. Use shoot-dodging to defeat them. Step into the room slightly and turn around as three more enemies are approaching your rear flank. Enable bullet time and eliminate them as they enter the area. Grab all of their weaponry. An additional three enemies enter on the far side of the area. Peer around a corner and eliminate them. Grab the painkillers from the medical box.
Traverse this area and get word from Max. Walk to the door at the far end. Open the door cautiously and watch the guy strutting his stuff. Enter bullet time and lay waste (use the MP5 or even a desert eagle). Work quickly and head to the far end of the room and take out three more enemies to the right.
After clearing the room, move to the center of the area and find the hole. Leap down onto the girder then drop into the room to complete the chapter.