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 mods the Bukkit add-on to work on an official modding API, allowing mod developers easier access to the "Minecraft" game files. In May 2015, Mojang announced on social media that they were "still working" on this API, despite announcing it over three years ago. Concern arose following Microsoft's acquisition of Mojang in late 2014. Members of the modding community feared that "Minecraft"s new American owners would put an end to Mojang's established practice of giving free rein to mod developers. Despite the concerns, Microsoft has not announced any changes to Mojang's policies. In April 2015, Microsoft announced that it was adding