Sonic - Lost World (Japan) (ソニックロストワールド) is a platform game developed by Sonic Team and published by Sega for the Nintendo 3DS. The game is a part of the Sonic the Hedgehog series and follows Sonic the Hedgehog as he attempts to restore balance to the world by collecting the seven Chaos Emeralds. The game features a variety of levels and challenges, as well as a new moveset for Sonic. Players must navigate various obstacles and enemies while collecting rings and other items. The game also features a two-player cooperative mode, allowing players to team up and take on levels together. Sonic - Lost World (Japan) is a fast-paced and challenging game that is sure to keep Sonic fans entertained.