Kingdom Hearts: Chain of Memories is an action RPG co-developed by Square Enix and Disney Interactive for the Game Boy Advance in 2004. Blending iconic Disney characters with original creations, it sends Sora into the mysterious Castle Oblivion to search for his lost memories. The game introduces a unique card-based battle system where players deck-build and combine cards to attack, cast magic, and summon allies, requiring strategic thinking in every fight. The story continues directly from the previous entry and explores themes of memory and identity. Along the way, familiar faces like Donald, Goofy and Final Fantasy heroes help uncover the secrets behind Castle Oblivion.