IGN writes: "Who doesn't love a carnival? The intoxicating smell of cotton candy, the whirling lights and cacophonous sounds.......the flesh-eating zombies.
In keeping with its recent trend of revealing new maps and monsters at each of the year's gaming trade shows, Valve Software brought its co-op zombie shooter to the 2009 Penny Arcade Expo to show off the Dark Carnival map. You could wait in line for more than an hour to play the demo at the show, or you could read this preview instead. Smart choice".