Chainsaw

"And if we run out of bullets.... Baby, they gonna wish we hadn't!"

- Coach

"DIE, DIE, DIE MY DARLINS!!!! DIE, DIE, DIE!!!"

- Ellis

"YEEEEEAAAAHHHH!!!"

- Nick

The Chainsaw is a close combat weapon introduced in Left 4 Dead 2. When used, it is held out in front of the Survivor, dealing heavy damage to any Infected in it's way and giving the worst injuries to Common Infected by far. However, the Chainsaw runs out of gas after about one minute of continuous usage, causing the Survivor to drop it and pull out a P220 Pistol. A Survivor cannot refill the Chainsaw.

Unlike other secondary weapons, the Chainsaw is a rather rare find, usually spawning out of the way, normally in the same areas that the Grenade Launcher can be found. The Chainsaw takes up a rather large area of the screen when out and a larger area when spinning, and does a lot of friendly fire damage.

When a Survivor is using the Chainsaw, Common Infected are attracted to them. Against Boomers and Spitters, it's best to use your primary weapon, although you can kill a stationary Witch with the Chainsaw before she can get up and strike you. You can also hold out the Chainsaw to kill a Jockey or a Hunter before they can get to you.

Tactics

 * The main usage of Chainsaw should be preserved for Gauntlet events (if featured in level), where you have to rush forward as fast as possible, while the zombies pile up on you endlessly. Such an event is The Screaming Oak rollercoaster, as well as the strange alarm setup in second level of The Parish.
 * The Chainsaw's long rev-up time means that switching to it in the middle of a horde is a bad idea. Instead, find some cover before pulling it out, or just momentarily back to a wall and shove the horde back when revving up.
 * When covered in Boomer bile, the Chainsaw is a good option to rip through the incoming horde. However, the bile also makes it more difficult to watch for your teammates, so be careful, though you should inform your team that you're going to use your chainsaw in such a way and they should be wary (assuming they haven't been caught in the bile as well).
 * Keep your distance from other Survivors when using the Chainsaw so to avoid hurting them and make it easier for them to shoot Common Infected attracted to you.
 * When using the Chainsaw, it's usually best to pick up a primary weapon with good range, such as an Assault Rifle or Sniper Rifle, for taking out Special Infected.
 * A Bile bomb works well with the Chainsaw, making it easy to line up Infected for kills. However, aside from just clearing an area, the Bile bomb actually spawns additional zombies, which will attack the closest survivors to them. This is not a good thing when the bile wears off and they have not been killed.
 * The chainsaw has limited fuel, so make sure your other weapon has a good reserve of ammo. It cuts out after about 1 minute of usage.
 * When fighting a Tank, using the chainsaw will usually result in you getting punched away, so wait for the Tank to be climbing a ledge or otherwise distracted before cutting loose on him. In Versus mode, use the chainsaw very warily upon the Tank, as it has a melee attack that goes 270 degrees. and the player operating the Tank can usually hear a chainsaw easily. It is safest to attack a Tank from behind, especially when it is throwing a rock.
 * The chainsaw is the only melee weapon that will allow you to free yourself from a Smoker's tongue while being initially grabbed. This doesn't seem to always work, be it lag or a glitch.
 * The Grenade Launcher and chainsaw don't work too well together, because the chainsaw has a long rev-up time, while the Grenade Launcher has a long reload time. Both are hard to come by in a Campaign, and cannot be refilled by basic ammo boxes. In addition, both weapons do heavy friendly fire damage, and neither is very good against Special Infected. Aside from Versus, the grenade launcher can be a great equalizer against Special Infected. However, in good hands, they can be pretty useful.
 * When trying to kill a Witch with a Chainsaw on Advanced or Expert DO NOT face her head-on but instead attack her from behind, as she has to turn before attacking, which gives you a bit more time to attack, and most of the time just enough to kill her. On Normal it is possible to saw her head-on and kill her before she attacks. But it is risky. To be safe always attack her in her back. Unless you have no other choice.
 * A good way to conserve fuel is to just tap the left mouse button, or trigger, to make the chainsaw cut instead of holding it down and wasting fuel on empty air.
 * Getting knocked down forces the survivor to rev up the chainsaw again, which can make it dangerous to use against Tanks and Chargers.