Eurogamer have been taking a look at Turtle Rock Studios' source powered Zombie co-op shooter Left 4 Dead and seem suitably impressed.

There are four campaigns, each divided into five maps and representing a serious but manageable chunk of playtime, and designed for replay value above all else. Though the level design is fairly linear, an AI director controls the pace and dynamic of the action, meaning they never play the same twice. The one we play leads through homes, stores, streets, sewers, gas stations, warehouses and a horrific hospital full of screaming zombies in floral smocks, before culminating in the defence of a rooftop radio tower while awaiting helicopter rescue. Rural, wooded settings are also promised, which should provide a welcome change from the convincing but over-familiar concrete and twisted metal.

Those of us who have been crying out for more co-operative games are definitely looking forward to trying this one come summer on the PC, an Xbox 360 version is also planned.