Kingdom Hearts is an action role-playing game where you play as Sora, a young hero traversing various Disney worlds to find missing friends and stop darkness. The core gameplay mixes real-time action combat with traditional RPG progression; you gain experience to level up, boosting stats and unlocking new abilities. Its unique appeal is the crossover setting, blending Square's RPG mechanics with iconic Disney narratives and characters. Released in 2002, this main title focuses on exploration and story integration across its diverse realms.
Progression is managed through an experience-based system. Players gain experience points by defeating foes, with rewards scaling based on the difficulty of the enemy encountered. Accumulating experience leads to leveling up, which directly enhances core statistics such as strength, defense, magic power, hit points, and magic points. Furthermore, new, predetermined abilities are unlocked periodically as the player advances through the levels, offering character growth throughout the journey.
This fusion is supported by an all-star voice cast, often featuring the official voice actors for the Disney characters, lending authenticity to the interactions within the game worlds. The game features an experience-based progression system where leveling up unlocks new, predetermined abilities.
As a main title, this game does not feature any downloadable content (DLCs) or official expansions released post-launch.

Originally released only in Japan on December 26, 2002, Kingdom Hearts Final Mix has several events and a number of gameplay tweaks that are not in previous releases. Spoken dialogue is in English, with Japanese subtitles. New scenes, clarifying certain plot points, such as Riku's journey and foreshadowing of Kingdom Hearts II, were included, but no new dialogue was recorded. A gameplay option allows the player to skip cutscenes after seeing them once. The optional bosses first included in the English version were introduced to Japanese players for the first time, along with a new fight against "Unknown Man," in an attempt to raise interest for the sequel.

The Platinum Limited Edition of Kingdom Hearts Final Mix comes in a Cardboard Box and includes the following content: - 1 PS2 game "Kingdom Hearts Final Mix" - 1 "Block - Sora" figurine - 1 post-card calendar - 3 badges - 1 set of stickers