Sonic Lost World is a 2013 platform game developed by Sonic Team. It is part of the Sonic the Hedgehog series and was released in October 2013 for the Wii U and Nintendo 3DS in PAL regions by Nintendo and by Sega in North America and Japan. A port of the Wii U version for Windows was later released in November 2015. Lost World focuses on the efforts of Sonic the Hedgehog to stop the Deadly Six an alien tribe that serves as the game's main antagonists as they seek to siphon the world's energy from the Lost Hex the game's setting. Sonic and his long-time sidekick Tails must team up with Doctor Eggman normally their enemy to stop the Deadly Six leading to conflicts among the three parties. While the gameplay is typical of the Sonic series in some ways it adds parkour mechanics and features largely cylindrical level design with an emphasis on alternate pathways. The game also features the Wisp creatures from Sonic Colors as power-ups.