Jump Festa
It was announced alongside "Kingdom Hearts Birth by Sleep" and "Kingdom Hearts 358/2 Days" at the Tokyo Game Show on September 20, 2007, where a trailer was shown in a photo-prohibited theater. New trailers were shown at the 2008 Jump Festa in December 2007 and the DKΣ3713 Private party in August 2008. Playable demonstrations, as well as new trailers, were available at the 2008 Tokyo Game Show in October 2008 and the 2009 Jump Festa in December 2008. Early trailers highlighted "coded"s gameplay, while later ones focused more on the game's story, which would fill in some plotholes present in the first "Kingdom Hearts" game.