Valve has confirmed the release date of this week’s “The Passing,” which will be this Thursday, and the price will be 560 MSP on Xbox 360, and free for PC players.

Along with the previously mentioned additions, Valve has also revealed the every new achievement being added, along with a new “Mutations” feature.

Read on for the Achievements, and more info about “Mutations!”

The Passing Achievements

	Torch Bearer Survive The Passing Campaign.
	Port of Scavenge Play 5 full games of Scavenge on The Port.
	Fore! Knock off the heads of 18 infected with the golf club.
	Til It Goes Click Using the M60, kill 25 infected without letting go of the trigger.
	Killing Them Swiftly To This Song Play the new Midnight Riders song on a jukebox.
	Wedding Crasher As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
	Cache Grab Open 5 foot lockers.
	Kite Like a Man Kill a tank only with damage from the original Survivors.
	Grave Robber Collect 10 items dropped by a Fallen Survivor.
	Mutant Overlord Play 6 Mutations.

Mutations

What exactly are Mutations? Excellent question!

Mutations are special gametypes that cycle on a weekly basis, similar to Rock Band 2’s “Battle of the Bands” feature. There are twenty Mutations planned so far, one of them called “Chainsaw Massacre,” giving the Survivors all chainsaws and an unlimited supply of gasoline. Should be fun, eh?

Each Mutation will be playable in all Left 4 Dead 2 campaigns, but players must have “The Passing” in order to play them.

More info will be revealed tomorrow, so stick around to find out some new information. Maybe even the second gametype!