Tension

Start by waiting for the patrol in the south-west to be near the sentry, then rush in and punch them both out quickly. Kill them off and take the shotgun.

Wait for the dog or a patrol to wander in front of the door to the south-west room and shoot them. Stand inside to the lower-left with a clear sight through the doorway. Shoot all enemies as they cross into your gun's line of sight. Take out the guy in the north-west if he didn't already rush you in the doorway. Pick up another gun.

Go to the door for the mid-north office and kill one guy, then quickly retreat to the north-west bathroom. Aim at the door and kill them as they search for you.

Hold the cursor to the right and aim at the two melee guys in the south-east. Shoot through the blue glass walls to kill them. The final guy in the north-east can be taken out any way you choose. Pick up a knife before you move to the second floor.

Immediately kill the guy who enters the hallway, then wait near the doorway. Use the knife to kill the patrol guys as they walk past the door.

Keep the knife and do the same thing with the next two patrol guys, then use the knives to kill the two guys in the north hallway. Finally, kill the guy in the north-west pool room. Grab a gun and go to the far east room. Aim at the west room door (with all the wires) and shoot it from as far away as you can. An explosion will kill everyone in that room.

The two guys behind tables can be killed with any gun, but you have to shoot them the moment they're in the line of sight. Otherwise they'll shoot you. You can also rush in and keep moving to shoot them while locked on but get past their fire.

Return to the car when you're done.