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
Minecraft and has never been commercially advertised except through word of mouth, and various unpaid references in popular media such as the "Penny Arcade" webcomic. By April 2011, Persson estimated that "Minecraft" had made €23 million (US$33 million) in revenue, with 800,000 sales of the alpha version of the game, and over 1 million sales of the beta version. In November 2011, prior to the game's full release, "Minecraft" beta surpassed 16 million registered users and 4 million purchases. By March 2012, "Minecraft" had become the 6th best-selling PC game of all time. , the game has sold 17 million copies