Kingdom Hearts: Chain of Memories (Japanese: キングダム ハーツ チェイン オブ メモリーズ Hepburn: Kingudamu Hātsu Chein Obu Memorīzu) is an action role-playing video game developed by Jupiter and published by Square Enix in 2004 for the Game Boy Advance. The game serves as an intermediary between the two larger-scale PlayStation 2games in the Kingdom Hearts series. It was one of the first GBA games to incorporate full motion video (FMV). The game was remade into a PlayStation 2 game titled Kingdom Hearts Re:Chain of Memories, which was released in Japan as a second disc packaged with Kingdom Hearts II Final Mix in March 2007. The remake was released in North America on December 2, 2008.
Kingdom Hearts: Chain of Memories is the second game in the Kingdom Hearts series. It is a direct sequel to Kingdom Hearts, and its ending is set about a year before Kingdom Hearts II. The game follows Sora and friends, exploring a mysterious castle. There, Riku, explores the basement levels and fights the darkness. The game introduces new characters and plotlines that further expand the Kingdom Hearts universe and set up the premise for Kingdom Hearts II.
Though not as successful as the other Kingdom Hearts games, it received positive reviews and sold well. It was praised for its story, graphics, and FMVs. The game features a new card-based battle system that is a departure from its predecessor. When it debuted in Japan, it sold 104,000 units in 48 hours.