is an action role-playing video game co-developed by Square Enix and Jupiter, and published by Square Enix in collaboration with Disney Interactive in 2004 for the Game Boy Advance. The game serves as an intermediary between the two larger-scale PlayStation2 games in the Kingdom Hearts series. It was one of the first GBA games to incorporate full motion video (FMV). 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, as they explore the mysterious Castle Oblivion while battling the sinister Organization XIII, a group of antagonists new to the series. The game introduces new characters and plotlines that further expand the Kingdom Hearts universe and set up the premise for Kingdom Hearts II. The game features a new card-based battle system, in a departure from its predecessor's real time combat system. Though not as successful as the other Kingdom Hearts games, it received positive reviews and sold well, with particular praise for its story, graphics, and FMVs, but the card-based battle system was criticized. When it debuted in Japan, it sold over 100,000 units in 48 hours. The game was remade for the PlayStation2 as Kingdom Hearts Re:Chain of Memories, released in Japan as a second disc packaged with Kingdom Hearts II Final Mix in March 2007. The remake was later released in North America on December 2, 2008 and was remastered in HD and included in the Kingdom Hearts HD 1.5 Remix collection released in 2013 for the PS3 and later for PS4, Xbox One, and PC. Gameplay Kingdom Hearts: Chain of Memories is a combination between a role-playing video game and collectible card game. The main role-playing aspect is an experience point system that is used to increase the character's maximum health or Card Points, or to learn a new skill. The cards are utilized in the progression of the story as well as in combat. The game features a field map and battle screen. The field map is an isometric area where the player can traverse between rooms. Enemies inhabit the field map and track the player to engage in combat, which can be initiated through contact between the player and an enemy. Once combat has been engaged, the game switches to the battle screen which