Kingdom Hearts IV key artworkArt: Square Enix © Disney

Steam leak lists KH4 worlds

Kingdom Hearts IV's world list leaked through Steam itself. A Valve backend error briefly made private achievements visible through the public API, and achievement trackers scanned them in before access was restricted. Exophase owner Mike Bendel confirmed the mechanism on ResetEra: a Valve-side mistake, not a breach. Kingdom Hearts IV (Steam app 3216600) was one of dozens of unreleased games caught in the trawl, alongside Persona 6 and Fable.

Fans take the listing seriously for one reason: it includes the single world Square Enix has officially confirmed. Coco's "Land of the Dead" appears with the achievement "Remember Me-nial Laborer: Complete all requests in the Land of the Dead", matching the D23 reveal exactly. A fabricated list would have no reason to nail the one confirmed world.

The Japanese achievement names add a second layer, and they stayed visible longer: Exophase's Japanese page still listed all 50 achievements on September 10. Steam localizations spell out world names directly instead of hinting at them, so the Japanese text confirms two destinations the English coverage missed, plus how the story is structured.

Square Enix has not commented on the listing, and Kotaku says it reached out for comment. Backend achievement data can change before a game ships, so treat the names below as listing data, not a final roster. The details follow in two sealed sections, for readers who prefer official reveals:

Star Wars"A Galaxy Far, Far Away": the achievements "Desert Do-Gooder: Complete all requests in the Galaxy Far, Far Away" and "May the Light Be with You" point to a Star Wars world, a first for the series.

Zootopia"Savanna Central": "Magnanimous Mammal: Complete all requests in Savanna Central" names Zootopia's district directly.

Haunted MansionA directly named achievement, another series first after years of park ride speculation.

Returning worldsThe listing has Toy Story's "Toy Box" and the "Underworld" ("A Hot Tip: Get some advice from the lord of the Underworld", plainly Hades) returning.

100 Acre Wood"Friends Forever" clears the "100 Acre Wood" episode, so the listing brings back Winnie the Pooh's world, complete with Pooh minigames (raft fishing for every fish and lost item, a forest orchestra to conduct).

Keyblade Graveyard"Another Possibility" clears the "Keyblade Graveyard" episode. The English list carried both achievements without naming their worlds; the Japanese text removes the doubt.

Already knownQuadratum ("Life in Quadratum") and Scala ad Caelum ("Speed-Reader: Set a new record for every time trial in Scala ad Caelum") round out the list.

Episode structureStar Wars, Coco, and Zootopia each have Episode 1 and Episode 2 achievements, so the listing sends Sora to those worlds at least twice across the story. One mid-list achievement describes returning from Quadratum, which fits a journey that leaves the city and comes back.

Placeholders"Monochrome Origins" and "Imagineer Planet" ("Planet Producer: Complete any mission on the Imagineer Planet", "Globe-Trotter: Complete all Test Planets"). Thinnest evidence in the leak: names only, no descriptive achievements, and the "Test Planets" wording reads like internal labels that may never ship. spilled.gg notes some fans read the monochrome title as an Oswald the Lucky Rabbit nod; that is speculation, not text.

SystemsThe Japanese names outline how the game plays: equippable roles with role points; Keyblade scrap actions and build finishers; Link Pieces for summon finishes; Donald's Warlock Fusion; Goofy's weapon-stealing Magnegrab; Lucky Marks in every world; Keybooks and time trials in Scala ad Caelum; Sora's days "as a Dandelion" out of Union χ; and an Ultima Weapon achievement, as tradition demands.

The finaleThe last story achievement translates roughly as "The Last Name", for beating "the last one standing in the end". spilled.gg further reports its icon art reads "His name is Kara", which fans connect to the Master of Masters, while noting placement suggests postgame content. That detail rests on icon art this guide has not independently verified: the thinnest claim in this leak.

Kingdom Hearts IV is dated late 2027, and Square Enix brings it to Tokyo Game Show next week (September 17 to 21) in lineup-only form. If any of these names get confirmed, that stage is the next likely venue. Until then, the list above is what Steam briefly showed, nothing more.

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Source: Exophase