'' Castlevania : Harmony of Despair '' was first leaked as an OFLCA Rating on May 27 , 2010 , then officially announced for Xbox Live Summer of Gaming 2010 . Later in the year , the game was unveiled as a playable demo in the Konami booth at the E3 Convention of 2010 . '' Castlevania : Harmony of Despair '' was released worldwide on August 4 , 2010 for the Xbox Live Arcade and September 27 , 2011 for the PlayStation Network . On March 14 , 2019 , it was added to Xbox One backwards compatibility , marking the first time the series has been on another platform in nearly a decade
E3 Convention of 2010
E3 2010
Castlevania: Harmony of Despair