The ever-popular voxel sandbox title Minecraft has surpassed 10 million units sold on PC according to a new tweet by Jens Bergensten, Mojang's lead designer and developer. The tweet was also accompanied with a "subtle" image of a horse, a hint at what is next to come for the PC title with the addition of horses to the game.

Minecraft (PC) has hit 10M! As promised, a subtle hint on the main 1.6 feature (thanks @ebbakier): http://imgur.com/qAuCLex :D

It is currently unclear when exactly the update will occur, or what exactly the horses will look like in the quite blocky art style.

Initially Minecraft was released on PC as an Alpha in May of 2009, with a full release following years later on November 18, 2011. Earlier this year Polygon reported that Mojang's revenue for 2012 was a whopping $237.7 million.

Currently 4J Studios' Minecraft: Xbox 360 Edition is sitting at more than six million downloads, adding even more popularity to the brand.