4 cheat codes for Kingdom Hearts on PS2.
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Kingdom Hearts (2002) has no built-in codes — every 'code list' online is GameShark/Action Replay territory (and PS2 AR codes can corrupt saves). Final Mix's added items come from gameplay.
No built-in cheat codes exist for this game. See the entry description for what actually works on each platform.
Power-up synthesis (Power/Magic/AP Boost items) is the intended stat-overcap route; the Moogles' Mystery Mold farming is the famous early gil loop.
No built-in cheat codes exist for this game. See the entry description for what actually works on each platform.
Beat the game with all Keyholes sealed and enough completion progress to earn the 'Another Side, Another Story' secret trailer after the credits, teasing Kingdom Hearts II. (Final Mix remakes extend this with the 'Deep Dive' variant and harder conditions.)
On Standard difficulty, complete Jiminy's Journal, all Gummi Ship missions, and find all 99 Dalmatians. On Proud difficulty, simply complete Jiminy's Journal.
Synthesize the most powerful Keyblade in the game, the Ultima Weapon, at the Moogle shop. It boasts high stats and grants the MP Hastega ability.
Gather 5 Orichalcum, 5 Mythril, 5 Dark Matter, and 10 Energy Stone from various sources, then visit a Moogle to craft it.