Undead Labs has announced on its blog that State of Decay sold over 250,000 copies through XBL Arcade within 48 hours of release.
The only XBLA game which sold more at the same rate was Minecraft Xbox 360 Edition.
“We did not have an ad budget,” the firm wrote. “We didn’t have a physical copy to load onto shelves, no worldwide multimedia push, no studio reputation with millions of followers. All we had was what we believed was a great game and a great community. And make no mistake, a solid game is not enough, not in 2013. Plenty of great games wither away in obscurity.
“This train got rolling because you got out and pushed.”
Undead Labs said it has not forgotten about Germany or Australia/New Zealand and is working on getting the game released in those regions.
Formerly known as Class3, a PC version of the game is also in development a release date has yet to be confirmed.
State of Decay was released on June 5.