Mutations

"Each week one new Mutation is featured and the previous Mutation retired."

- Valve

Mutations is the name for a new set of gameplay modes that was released alongside the new campaign, The Passing in Left 4 Dead 2. The Mutations are special game modes that run for one week before it is retired, and replaced by a new Mutation each week as they become announced on the in-game Blog Post every Thursday. Presumably after all the Mutations have been revealed, a poll will be conducted once a month for players to vote for their favorite Mutation, which will return the following week. It is only available to those who have downloaded The Passing.

Revealed Mutations
There are over 20 different Mutations planned, and playable on all Left 4 Dead 2 Campaigns.

So far, the following have been revealed on Valve's blog in the scheduled order along with their taglines:

Unrevealed Mutations
The following were found in a Steam-Group annoucement and have not been seen in a schedule as of yet. As they have not been announced by Valve yet, they may still be subject to changes or removal.

There are four more Mutations, but nothing more is known about them. The mode that they will be used in, however, has been confirmed. There are:


 * 2 More Mutations for Campaign Mode.
 * 1 More Mutation for Versus Mode.
 * 1 More Mutation for Scavenge Mode.

Bleed Out

 * A good tactic for this is if you all have headsets and you like teamwork, because every one will have there own part in this, is to have all four survivors bunched throughout the campaign, the front survivor is what I like to call the "Suicide Survivor", because they will be the first into a room to look for SI (what I also liked to do in realism mode). If the survivor is pinned the other four will be close by, shooting the infected. The survivor will most likely be very damaged because the temporary health, so they will use there pills (or someone else's, if you want to keep that survivor being the suicide survivor, you can change up the lineup if you want). But don't forget, the other survivors health will be ticking down, too, so the back survivor will look behind them for pills/adrenaline. If found that survivor will tell the others they found some, they take there's, picks up the other, and hands it up to the next survivor who needs it. The middle two will have the easiest job, killing all of the stray common, UCC, or special, if you stay together, if one gets pinned the others can save them. This may be a very common tactic for most if not all game modes, but I find this the most effective for this mutatioon in perticular. This is just my personal advice, me and my friends have expirmented with and none of us died once. It might work for you, just might.