Block-building strategy game Minecraft has sold 2.5 million copies despite being unfinished.
Markus Persson, a lead developer at Mojang which makes the game, announced the Milestone in a recent tweet, also pointing out that the Lego-for-grown-ups phenomenon had now outsold both Diablo and FarCry.
Minecraft is unusual in that it was originally went on sale while it was still in the Alpha stage of production and has used feedback from fans to develop the browser-based game.
Still in Beta even now, the current version sells for €15 with the finished article expected to weigh in at €20 when it reaches its expected November 11th launch date.
The game, which has acquired something akin to cult status amongst its legion fans, may have blown some of its cool when it was used as part of Microsoft's E3 presentation, but the brand seems to have really taken off from its humble beginnings with both mobile and Kinect-enabled Xbox versions planned for later release.
The game's popularity stems from its creators' stubborn belief that, although pretty graphics and blistering frame-rates may make people go 'ooh' for five minutes, playability and longevity are still king amongst gamers.