Original: It was developed by Square Enix's fifth Product Development Division, based in Osaka, and released as the second disc of Kingdom Hearts II Final Mix + in Japan on March 29, 2007 and as a standalone title in North America on December 2, 2008. It has not been released in Europe or Australia.
Simplified: It was released together with Kingdom Hearts II Final Mix + in Japan on March 29, 2007, and was released as a standalone title in North America on December 2, 2008.