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 official modding application programming interface (API). Texture packs that alter the game's textures and HUD are also available, as created by the community. In July 2013, texture packs were replaced with "resource packs", which have the same role as texture packs, but allow custom audio as well. Players are also create their own maps, which often contain specific rules, challenges, puzzles and quests, and share them for others to play. In August 2012, Mojang added adventure mode for custom maps and in October 2012, Mojang added command blocks, which were created specially for custom maps. In February 2016, Mojang added