Template:Keystrategy

Also see: Tactics

All campaign walkthroughs are done on Normal difficulty in single player, and are meant to give tips on what to do and generally point out things that might otherwise be missed.

There are, of course, a few key things to always remember:
 * Stop, look, and listen.
 * Stopping to observe your surroundings might allow you to prepare for something nasty, like a Witch, Tank, or special Infected in a really bad place for them to be.
 * Things can always get worse.
 * Are you and your teammates all hurting, your health down under 50%? Well, guess what? The Director is feeling particularly sadistic; you are now facing a Tank with Tier 1 weapons.
 * Teamwork.
 * This cannot be stressed enough. Left 4 Dead is supposed to be a cooperative game. Communicate with your teammates, if you're playing with others, or if you're by yourself with the AI, point out things they might otherwise miss. In all cases, watch out for each other and take care of each other. You are not going to survive the zombie apocalypse by yourself.
 * Be ready for anything.
 * Don't panic.

Use
''This template is the heading of all walkthroughs. It is a list of things to always keep in mind while playing Left 4 Dead.''

Created so that articles on chapters that include walkthroughs are easier to add and maintain: as they should all be uniform, editing a master copy of it is much easier than finding all of the instances of the key strategies and changing them individually when revisions are made to the tactics, and this also eliminates the need to copy and paste the strategies into have to find this in another article and then copy and paste it into a new article if it's needed there.

The variable will be substituted by a short summary of the chapter, preferably only a few lines long.