Left 4 Dead 2 adds single player Mutation

Last Man On Earth pits one survivor against everything.

Valve has revealed the lastest Left 4 Dead 2 'Mutation'.

The game mode, which changes every week, has now switched to the brand new Last Man On Earth.

The idea is that it's a single-player mode, which pits you as the only survivor against everything. You have to run through the entire level by yourself without any help.

That means no getting pounced, no being smoked and taking out tanks single-handed. For those who thought Expert Realism wasn't much of a challenge, good luck bludgeoning your way through this one.

You'll almost be wanting the aggro Xbox Live noobs who waste all your pipe-bombs to randomly wander in your game, as per usual...