What's new in Left 4 Dead 2? This collection of direct feed gameplay snippets from Valve's quick sequel shows off the highlights: melee weapons, incendiary bullets, new Special Infected, zombie killin' action set during day time and... tractors!

Yes, this is the South, so you'll come across a John Deere or two in your journey from Savannah to New Orleans, whacking scores of infected with frying pans and axes. Left 4 Dead 2 looks to retain most of the gameplay established in the original, adding new infected like the Charger and four all new Survivors. Also new: fiddles.

The sequel also adds a little more clear military involvement, as you can see in this raw gameplay footage. Those air strikes were hinted at in the game's original teaser trailer, but we get to see them in action here. Also previously seen, but briefly, is the new pipe bomb effect, which sends some infected flying, rather than turning them all into red mist.

Take a gander and see if there's anything we failed to point out during our hands-on time with Left 4 Dead 2. Let's hope the new footage is more warmly received than the idea of a sequel itself.