Controls

These are the default controls of Left 4 Dead for both the PC and Xbox 360 versions.

Context sensitive controls

 * The X button is to interact with other things. Using it, you can pick up objects, open doors, or help other survivors to their feet.
 * Select the First aid kit, target a teammate and press and hold LT to heal them. It has the same effect as them healing themselves. (It will therefore take 5 seconds and heal 80%)
 * Select the Pain pills, target a teammate, press and hold LT to give the pills to them.

Refer to Health for further tips. Make sure your teammates know how to revive you and give first aid kits and/or pain pills to you. The Survivors need to watch out for each other.