12Riven ―the Ψcliminal of integral― is a Japanese visual novel developed by KID, Cyberfront, and SDR Project and that was released on March 13, 2008 for the PlayStation 2. There is a regular edition, and a special edition which included the game's original soundtrack. KID are known for producing the Memories Off series, and the infinity series which includes Remember11 and Ever17. When KID declared bankruptcy in November 2006, production on the game was halted until Cyberfront took over and resumed production.