Mojang the continued development of "Minecraft". Within a year, the company grew to a size of twelve employees, with their second video game, "Scrolls", in development, as well as serving as the publisher of "Cobalt". In 2011, Napster founder and former Facebook president Sean Parker offered to invest in Mojang, but was declined. By March 2012, the company had accumulated revenues of over $80 million. In September 2012, Mojang began a partnership with United Nations Human Settlements Programme called "Block by Block", which entails having "Minecraft" players constructing sites in-game to use as a basis for assisted development of the village
Markus Persson was released on 18 November 2011. Persson left his job as a game developer to work on "Minecraft" full-time until completion. In early 2011, Mojang AB sold the one millionth copy of the game, several months later their second, and several more their third. Mojang hired several new staff members for the "Minecraft" team, while Persson passed the lead developer role to Jens Bergensten. A version for Android and iOS, the "Pocket Edition", has also been released. An Xbox 360 edition of "Minecraft" was released on 9 May 2012. The Xbox edition features updates including a tutorial and skin packs.