The post-apocalyptic zombie survival game, State of Decay, was a bit of a runaway success when it launched on Xbox Live back in June. The first offering from Jeff Strain’s Undead Labs studio managed to sell over 500,000 copies in just over a month on the platform. Last month the titled debuted on Steam Early Access and has since broken the 1 million sold mark.

To celebrate the milestone, Undead Labs is giving fans a chance to win a free copy of the upcoming Breakdown DLC, which will add new Heroic Characters, additional weapons, and the new Survival Mode to the game. All you need to do to enter is head over to the Undead Labs website and post your favorite memories from State of Decay’s development or in-game experience. Five people will be selected and win a free copy of the Breakdown DLC, and ten others will win some Undead Labs swag.

Source: State of Decay One Million Sold