Left 4 Dead/The Apartments

Overview
This level starts off at the top of the apartment building. To complete the level, you need to travel to the base of the apartment and cross a few city blocks. The exit is recognizable by a staircase nearby a secure car.

Paths
At the top of the apartment, you can either enter using the staircase or through the breakable skylight. Advanced players may skip the apartment directly by attempting to jump onto the air-conditioning unit.

When approaching the exit, you can either follow the street directly, or take a longer route behind a heavy truck and fence.

Traps

 * One car alarm, located near the exit.