Sonic the Hedgehog 4: Episode II is a 2012 episodic platform video game in the Sonic the Hedgehog series, and the sequel to Sonic the Hedgehog 4: Episode I. The game was developed by Dimps, with assistance from Sonic Team, and published by Sega. The game was intended to emulate the original Sonic the Hedgehog games on the Sega Genesis. Episode II was released in May 2012 for Microsoft Windows (via Steam), PlayStation Network, Xbox Live Arcade, Android, and iOS, and in July 2013 for Ouya, and Nvidia Shield (as a preinstalled app). A version for the Windows Phone was slated to be released in July 2012, but was cancelled. A Wii version was planned to be released via WiiWare, although it was cancelled due to hardware constraints. An additional episode, "Episode Metal", which centers around Metal Sonic, is available for those who purchase both episodes for the same system. The game received mixed reviews from critics, although it was generally considered an improvement over Episode I, with praise for the game's improved physics, co-op mechanics and visuals, but criticism for its boss fights and level design. A third game in the series, Sonic the Hedgehog 4: Episode III, was planned but was ultimately cancelled.