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 in five weeks. The release of the game's PlayStation Vita version boosted "Minecraft" sales by 79%, outselling both PS3 and PS4 debut releases and becoming the largest "Minecraft" launch on a PlayStation console. The PS Vita version sold 100,000 digital copies in Japan within the first two months of release, according to an announcement by SCE Japan Asia. By January 2015, 500,000 digital copies of "Minecraft" were sold in Japan across all PlayStation platforms, with a surge in primary school children purchasing the PS Vita version. "Minecraft" helped improve Microsoft's total first-party revenue by $63 million for the 2015 second