The story from the PS2 game is extending on the Game Boy Advance with this RPG collaboration between Square-Enix, Disney, and GBA developer Jupiter. Sora, the Kingdom Hearts' hero from the first game, wanders into a castle where he and his companions, Donald and Goofy, realize their magic and skills, earned in the first game, have been completely stripped away. Sora must traverse the castle on his own this time. Donald and Goofy must stay behind, but they'll accommodate Sora during battles as special attack "cards." When Sora encounters a dark force, players are booted to a battle arena where he must wipe out the threat using his keyblade and special skills. The game's exploration portions take place in an isometric perspective, and require a bit of platform-style skill of jumping and climbing up ledges. It's up to players to battle enemies to collect cards that'll unlock doors to the next part of the map.