The series extends across four titles, all released on iOS and Android. Other platforms include Windows Phone, PlayStation Mobile and PlayStation Vita. A multiplayer social game, Chaos Rings Sigma, was originally in development for mobile platforms. First announced in July 2013, its scenario was written by the first game's writer Yukinori Kitajima, and featured all the series' core characters along with characters exclusive to Sigma. It was cancelled in 2015 for unspecified reasons.
