It has been less than two weeks since the launch of State of Decay gripping open-world zombie survival RPG from becoming the fastest-selling original Xbox Live Arcade game of all-time.

“ A new Sandbox Mode will be added to the game for free at a later date.

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State of Decay has now sold over half a million paid downloads in less than two weeks, reports Microsoft’s Xbox Wire website In addition, developer Undead Labs announced that a new Sandbox Mode will be added to the game at a later date, allowing you to play endlessly without any story missions to get in the way of your open-world tomfoolery.A PC version was also reaffirmed. Though no release date was given, it is confirmed to be coming to Steam. released a new title update that includes a new suite of improvements such as reduced cooldown times for commands, Zombies no longer falling through the floor in the Marshall courthouse, and weapons/vehicle repairs happening in the workshop at game dawn rather than real-world start of day.In an attempt to get the update out quicker in Germany, Undead Labs just pushed a new version of the game. Unfortunately, this went out all over the world, meaning that people with this new version (purchased on or after June 12) will have to wait another week to get the title update, as each version has to be independently certified.For a look at what State of Decay is like, give the trial version on Xbox Live Arcade a download or check out IGN's Let's Play video series below.

Alex Rubens is a freelance writer based in Seattle who spends too much time talking about Star Wars and The Fast and The Furious. Talk to him about it on Twitter at @alexrubens