You begin on the ground floor of an abandoned four-story apartment building. If you like, you can pull the wardrobe in front of the door (by facing the short side, holding Action, then pressing Back/Down to pull). This will give you a little more time before 3 gendarmes break down the door. It also prevents the one policeman who actually enters the building from following Lara up the stairs.
Head up the stairs.
When the policemen enter, they throw tear gas, and the building gradually fills up with toxic vapor. At this point, you can either keep ascending or return downstairs and kill one of the policemen (1) using melee attacks. (Stand close to him and tap Action once to punch, twice for one-two punch, or press firmly to kick.) If possible, try to attack him from the left, in order to shove him into the wall, instead of pushing him toward the 2 policemen with riot shields. If Lara gets too close to them, she will surrender. Game over.
Now you need to make your way to the top of the building, picking up goodies as you go. As you enter each apartment or side corridor, you'll find pockets of fresh air, but soon these rooms also fill up with poison gas. So don't hesitate too long or Lara will run out of breathable air and die. Ignore the boarded-up doors; Lara can't get in. Jump across the hole in the stairs between the first and second stories (i.e., the second and third if you speak American, but here in France, we'll use the European conventions).
As you reach the second level, there's a brief cut scene in which a chunk of debris destroys part of the floor. If you approach the apartment door near the hole, Lara says, "This door is locked. I'll need a key."
For now, take a running jump across the large hole...
...grab the far edge, and pull up.
Pick up a pack of health pills (1) on the floor in the hallway opposite the elevator.
Turn around, approach the movable wardrobe to the left of the elevator.
Pull it out of the way so Lara can continue upstairs.
There's a small medipack (2) (60% health) in the next side hallway.
After getting the health pack, barge through the nearby door to gain another upper-body strength upgrade.
Enter the room and find V-Packer standard cartridges (3) and K2 Impactor batteries (4) in the cabinets.
Exit the room and continue forward, then right.
Grab some bandages (5) in the next alcove opposite the elevator. Then continue upstairs.
A pile of debris at the top of the stairs prevents you from going all the way up. So, on the next landing, pull the heavy box out of the corner. (If you get here before barging open the door below, Lara won't be strong enough to pull the box, and you'll need to go back downstairs for the upgrade.)
Climb onto the box, turn around, walk to the edge, and jump to grab the railing ahead. Pull up.
Go through the door on the right into the MAINTENANCE ROOM.
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