You may find your first weapon upgrade here - if not, it will likely be a little farther in the level. Follow the stairs down to the turnstyles. It’s a little slower, but safer, and you might find a molotov or pipe bomb along the way. As soon as you exit the safe room you have two options - you can proceed directly down the stairs or you can go down the tunnel to the right.

This level is much more difficult than the first one, so be on your toes. Make it past this spot and it’s smooth sailing. Watch for smokers who will try and pull you toward it. Move as a group, and don’t hit the car! The alarm will call the swarm. From there, you can see the subway entrance. The back room of the building is dark, but look around, there are usually molotovs or pipe bombs. The first door on your left opens into a room that will always have a bottle of pills and might have a healthpack - don’t miss it! Continue through the building - it is less exposed inside, and can get you close to the safe room. There is a door here that lead into a building. Once you reach the end of the alley, go immediately right. Almost immediately to your left while moving through the alley is a room with shelves and boxes - check here for molotovs and pipe bombs. Smokers will try and grab you, and hunters and boomers will try and get the drop on you from there. Get to the alley quickly - once you get there, keep your eyes on the rooftops. When you drop through the hole to the bottom floor, make sure you and your allies go all at once - otherwise a crafty hunter or smoker could take advantage of the situation. Check closets and bathrooms for molotovs, pills and other goodies.

Move quickly through the apartments, there aren’t a lot of opportunities for special infected to jump you. The second way is a little quicker and can surprise the infected if they’re not ready, but it can also leave you exposed and separated, so be careful. You will start out on a rooftop - after grabbing weapons and health kits, you have two options: you can take the stairs, which is safer, or you can shoot out the nearby skylight and drop into a bedroom. This level is actually shorter than it looks, so don’t allow yourself to be overwhelmed. The first stage of the No Mercy campaign takes place in the apartments.

Left 4 dead 2 no mercy