Undead Lab's latest title, State Of Decay has sold over half a million copies, making it the fastest selling original title on XBLA.
The good news doesn't stop there for fans, since the developer said that it's planning to expand the game further.
"For a start," said Undead Labs, "I can tell you we're working on a sandbox mode designed to be a pure survival simulation."
Finally, it's also been revealed that State Of Decay an MMO, codenamed Class4 is also under consideration, although Undead Labs can’t move forward on it as Microsoft currently owns the rights to the IP. On the bright side for PC owners, the original game also has a version in development for Steam, although it's not clear who is the publisher.