Kingdom Hearts coded

Kingdom Hearts coded is the fourth mainline entry in the Kingdom Hearts series. The game takes place concurrently with the events of Kingdom Hearts II and helps explain the ending and other plot points from said game. Originally released exclusively in Japan for download on the Docomo Prime Series-P-01A Panasonic mobile phone, the game released over the course of eight episodes from 2008 to 2010. As of 2013, the app has been delisted and the website has been shut down, meaning their is now way to purchase this game anymore. However, all episodes were fully remade soon after the last episode released and compiled into Kingdom Hearts Re:coded on Nintendo DS. All cutscenes from this game have since been remastered in 2014 as part of Kingdom Hearts HD 2.5 Remix, complete with new scenes made specifically for this version for continuity purposes.

Relevance to Final Fantasy
Several Final Fantasy characters appear in the game.