How do I stop sucking as an Infected?
Left 4 Dead is a team game, so the first question is, are you and your fellow monsters playing well together? You should be talking, telling each other what you’re doing, coordinating attacks, noting weaknesses.
Use the maps to your advantage. Areas like the basement in the No Mercy subway, or the cornfield in the Blood Harvest finale, are inherently confusing for the Survivors. Places where they have to drop down to another level and can’t get back up again are excellent places to jump the stragglers.
Height is your friend– all the attacks work better if you can attack from above.
Hang out in front of a witch or an alarmed car, in hopes that they’ll fire at you and set off the fun.
Boomer: The key class, as he produces the disorientation that makes other attacks devastating. Tell your teammates where you’ll be attacking. Always spawn at the last possible moment so they can’t pick you off from afar. Try to spew on everyone– then go melee the ones you missed, in hopes that they’ll kill you, drenching themselves.
Forest areas are difficult, but there are generally rocks or little cabins you can spawn behind; you just have to be a little more patient.
Even a four-survivor boom will do little damage if the horde can’t get at them– e.g. if they’re ensconced in a subway car, or hiding in a room with just one exit. (On the other hand, it slows them down and keeps them busy, so it’s not worthless.)
Hunter: Basic strategy: wait for a boom, preferably attacking one of the non-boomed survivors. You get a bonus if you can pounce from a height.
Another basic strategy: Hunter or Smoker attacks survivor A; another hunter pounces whoever comes to rescue the victim.
Pay dirt comes when the survivors start to drift apart, even a little bit. Get the isolated ones; this works even better if your teammates attack the rest of the survivors to keep them away.
If you’re shoved off a victim, you can often get in a melee attack or two before you’re killed.
Smoker: I’m worst at this myself, but it can be a game-changer, since it can break up a cohesive knot of survivors. Try to smoke from a height, and always pull backwards (i.e., away from the direction they want to go).
Milling zombies will break your tongue, so it’s hard to smoke in the middle of a horde attack.
Single best smoker attack: pull someone from the roof in No Mercy 3. (Either the person dies, or someone has to go rescue them, hopefully to be pounced by a hunter.) Awesomest smoker attack: same level, pull them from the little room near the gas station, through the window, back into the alley they started from.
Tank: Avoid fire (which will kill you quickly) and open spaces (where the survivors can pour lead into you). Hit trees, cars, and forklifts (fortunately, the game will aim these for you).
Don’t obsess over any one survivor… hit whoever’s closest. Use the throw attack if no one is very close; keep aiming throughout the throw.
Tanks will normally scatter the survivors, making them excellent targets for the other infected. The latters should attack from behind since the survivors should be paying attention to Mr. Tank.
The director wants you to keep attacking. Don’t worry about that. If the survivors set an area on fire, it’s better to give up control to a teammate rather than plunge in.