The Left 4 Dead blog
has revealed a new game mode for Left 4 Dead 2 in the form of Versus Survival.
The basic run-down is pretty simple - one team of four works a survival map, fending off the undead to set a benchmark time, then a second team comes in and tries to beat that time. This goes on until one team can't one-up the other allowing for full declaration of a winner.
It's a pretty neat idea that sits well within the Left 4 Dead framework Valve have created. Let us know how it plays once you've checked it out.