Game modes include a survival mode, in which players must acquire resources to build the world and maintain health, and a creative mode, where players have unlimited resources and access to flight. Depending on game mode, players can fight computer-controlled mobs, as well as cooperate with or compete against other players in the same world. In Minecraft, players explore a blocky, procedurally-generated 3D world with virtually infinite terrain, and may discover and extract raw materials, craft tools and items, and build structures or earthworks. Minecraft has since been ported to several other platforms and is the best-selling video game of all time, with over 200 million copies sold and over 140 million monthly active users as of 2021. Following several early private testing versions, it was first made public in May 2009 before fully releasing in November 2011, with Jens Bergensten then taking over development. The game was created by Markus 'Notch' Persson in the Java programming language. Minecraft is a sandbox video game developed by the Swedish video game developer Mojang Studios.