Valve has revealed Left 4 Dead 2’s Scavenge gameplay mode.Scavenge sees survivors trying to fill a generator from gas cans scattered around the map, while the Infected stop them by any means necessary.The survivors are time-limited, but every can used to fill the generator (and yes, the filling action takes time) grants them a little extra on their clock. At the end of the round, the teams swap; whoever brought back the most cans wins.It’s made to be fast-paced, apparently, in much the same vein as the recently-releasedfor the original Left 4 Dead.We’re looking forward to seeing it for ourselves. For now, feel free to check out the reasons why you might want to with rather than waiting for the shop release. And hey, Australians? It sounds like you , too!