Microsoft's $2.5 billion acquisition of Minecraft developer Mojang has officially closed, announced Phil Spencer, the head of Microsoft's Xbox division, on Twitter today.

"It's official, today we welcome Mojang to the Microsoft Studios family," said Spencer. "We're excited for the possibilities ahead w/the Minecraft community."

Microsoft announced its purchase of Mojang in mid-September. The company said at the time that it anticipated the deal would close in late 2014, and that it expected the acquisition to be break-even in its current fiscal year, which ends June 30, 2015. As a result of the acquisition, Mojang's founders, including majority shareholder and Minecraft creator Markus "Notch" Persson, left the studio.

"It's not about the money. It's about my sanity," said Persson in a blog post the day the deal was announced.