Ougon Musou Kyoku is a 2D versus fighting game developed and published by 07th Expansion. It is considered a side spin off of the Umineko no Naku Koro ni murder mystery visual novel series and was originally released at Comiket 79 on December 31, 2010. The game was ported to the Xbox 360 by Alchemist in October 2011 as Ogon Musokyoku X, including new characters and balance tweaks. An append disc for the original game, titled Ogon Musokyoku Cross, was released at Comiket 81 on December 31, 2011.