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
Crown and Council "Crown and Council" was not originally intended for public release; Pettersson, an artist who joined Mojang to work on Scrolls in 2011, used the relatively simple project to learn to code. He believed that even if the game was to be distributed one day, it would be rebuilt by "real programmers". The game was worked on over multiple months and used bits of code taken from other Mojang projects. Pettersson credits "Minecraft Pocket Edition" programmer Aron Nieminen as his programming mentor. It is the first game developed by Mojang that is released on Steam, although Mojang published Oxeye Game Studio's