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Major Left 4 Dead 2 glitch discovered

A major Left 4 Dead 2 glitch has been unearthed - 'airwalking'

This glitch lets players use explosions to stagger off ledges and, quite literally, stagger around in the sky too.

The glitch currently works in all of Left 4 Dead 2's game modes.

Although it's too unwieldy to use in Versus and too damaging to use in Expert, its main use has come in Survival, where some players have been using it to access tricky areas that the infected can't reach.

Unfortunately Left 4 Dead also suffered botched leaderboards for its Survival Mode, so it's nothing new. History tells us that Valve will get round to patching it so if you see someone staggering around in the sky next time you play, remember that they're just enjoying it while they still can...

We put together a quick video showing the glitch and some of the areas you can reach using it.