State of Decay launches on Steam Early Access today, developer Undead Labs has announced.

You'll need to pay $20 for access, but this also grants you the full and finished game when it's ready later in the year.

"What you'll see this Friday, if you choose to join forces with us to make the PC version kick ass, is a test version," wrote Undead Labs community manager Sanya Weathers. "It's not ready to be reviewed. It will not be perfect. It may still have crashes.

"What it won't have is a keyboard and mouse interface...not at first. Why not? Over the next however many weeks, we will be putting up versions of the keyboard interface and using your comments and feedback to make it awesome. Right this minute, the Early Access version requires an Xbox 360 controller (or a compatible 3rd-party controller, although we haven't done much testing with those yet)."

Minimum System Requirements:

OS Version: XP SP3

Processor: Core 2 Duo 2.4GHz (E6600) / Athlon X64 3400

Memory: 2 GB

Graphics: Radeon HD 2600 XT / GeForce 9600 GSO / Intel HD 3000

DirectX: 9.0c

Disk Space: 3 GB

Recommended RequirementsL

OS Version: Windows 7 or newer

Processor: Intel Core i5 series or equivalent

Memory: 2 GB

Graphics: Radeon HD 4750 / GeForce GT 240 / Intel HD 4000

DirectX: 9.0c

Disk Space: 3 GB

State of Decay was well received when it launched for Xbox 360 earlier this year, scoring a highly recommended 9/10.