is a sandbox construction game, inspired by Infiniminer, Dwarf Fortress and Dungeon Keeper, created by Markus Persson, the founder of Mojang AB. The game involves players creating and destroying various types of blocks in a three-dimensional environment. The player takes on an avatar that can destroy or create blocks, forming fantastic structures, creations, and artwork, on multiplayer servers and singleplayer worlds across multiple game modes. Minecraft is available to players for €19.95 ($26.95 USD). Singleplayer and multiplayer, when purchased, can be played in the user's web browser, or using the downloadable launcher. Minecraft Classic is available to play for free. Minecraft development started around May 10, 2009, and pre-orders for the full game started being accepted on June 13, 2009. Minecraft's official release date was November 18, 2011. On April 5, 2013, Minecraft for the computer reached 10 million sales. On August 16, 2011, Minecraft - Pocket Edition was released for the Xperia Play. After its exclusivity with Sony expired, it was released for Android devices on October 7, 2011, and iOS devices on November 17, 2011 for $6.99 USD. On May 9, 2012, Minecraft was released for the Xbox 360 on Xbox Live Arcade for 1600 Microsoft Points ($20.00 USD), where it soon shattered every previous sales record. On February 11, 2013, Minecraft: Pi Edition was released exclusively for the Raspberry Pi. It is based on the Pocket Edition and is available for free at Mojang's dedicated blog. The Pi Edition is intended as an educational tool for novice programmers and users are encouraged to open and change the game's code using its API.