Sword Art Online: Lost Song (ソードアート・オンライン -ロスト・ソング-, Sōdo Āto Onrain -Rosuto Songu-) is an action role-playing video game for the PlayStation 3, PlayStation Vita, PlayStation 4 and Microsoft Windows based on the Sword Art Online light novel series. It is the third video game in the series and is the successor to the 2014 game Sword Art Online: Hollow Fragment. The game was released worldwide during 2015; it was first released in Japan on March 26, and was later released in the PAL region and North America on November 13 and 17, respectively. Lost Song's story is based on an alternate timeline of Sword Art Online that does not follow the canon storyline of the light novels. It follows series protagonist Kirito and his friends as they play the Virtual Reality Massively Multiplayer Online Role-Playing Game (VRMMORPG) called ALfheim Online (ALO). The game introduces a guild named Shamrock, led by scientist and idol Seven, who Kirito competes against to be the first to clear ALO's expansion, Svart ALfheim. Lost Song received mostly mixed reviews, with the multiplayer and controls being praised; however, the game's dungeons were criticized for being bland and recycled. Reviewers also stated the game appeals more to fans of the series. A sequel, Sword Art Online: Hollow Realization, was announced at Dengeki Bunko Fall Fest 2015 for PS4 and Vita, with a release date set in 2016.