Mojang 2012, Mojang was co-developing a video game codenamed "Rex Kwon Do" alongside an undisclosed developer. Before the title had reached a significant stage of development, Mojang cancelled the collaboration, due to their lack of involvement and influence on the project. In March 2012, Persson revealed that he would be designing a space sandbox game. Although Mojang teased with an April Fools' Day website based around "Mars Effect" (citing the Bethesda lawsuit), it was confirmed that the game was indeed in development, albeit with a different name. On 4 April, Mojang revealed the game's title to be "0x10", set in the
Minecraft meters above in-game sea level. "Minecraft" has also been used in educational settings. In 2011, an educational organization named MinecraftEdu was formed with the goal of introducing "Minecraft" into schools. The group works with Mojang to make the game affordable and accessible to schools. In September 2012, MinecraftEdu said that approximately 250,000 students around the world have access to "Minecraft" through the company. A wide variety of educational activities involving the game have been developed to teach students various subjects, including history, language arts and science. For an example, one teacher built a world consisting of various historical landmarks for