Steam Leak Exposes 145 Unreleased Games: Kingdom Hearts 4's Star Wars World Surfaces Early
A batch of data pulled from Steam's backend pushed two of Japan's most secretive publishers into the open. Kingdom Hearts 4's 48 to 50 achievements point to Star Wars, Zootopia, Coco and seven more worlds; Persona 6's list leaked its location, dungeons and new mechanics. Drawing on Forbes, Nintendo Everything, chainplay and Gematsu-sourced reporting, this piece covers how bad the leak actually is — and what it means against a Chinese gacha market that fell 8.97% year over year in the first half of 2026.
一、How It Happened: One API Glitch, 145 Games
Timeline: it started late on September 8 and spread by dawn
The leak began late on September 8, 2026, when achievement trackers Exophase and SteamDB pulled achievement data for unreleased titles through Steam's API, and spread across social media by early September 9 . Counts vary: GamingBible put it at "at least 145" games, another tally landed at 85, but the named titles are consistent — Persona 6, Kingdom Hearts 4, Fable and a new Horizon project.
What leaked: 50 achievements, 10 worlds
Kingdom Hearts 4 had 48 to 50 achievements exposed, two of them hidden. Persona 6's list leaked its setting, dungeon names and the new Velvet Room attendant — details Atlus had barely acknowledged publicly. That is the sharp edge of this story: nothing was guessed. Material both publishers planned to reveal over the next year was sitting on the internet at once.
二、The Ripple Effect: Two Companies That Hate Spoilers
Kingdom Hearts 4: Star Wars, Zootopia, Coco
The leaked world list includes Galaxy Far, Far Away (Star Wars), the Underworld (Hercules), Toy Box (Toy Story), Quadratum, Scala ad Caelum, Savanna Central (Zootopia), Haunted Mansion, Monochrome Origins, Imagineer Planet and the Land of the Dead (Coco). Star Wars had never been officially confirmed, though fans had speculated since the first trailer. Square Enix has said Kingdom Hearts 4 targets the second half of 2027 on PS5, Xbox Series X|S, Switch 2 and PC, and had officially shown only the Coco world.
Persona 6: Yokohama, "Hex," and a new Velvet Room attendant
The Persona 6 exposure hurts Atlus more. The achievement data points to a Yokohama setting and a main party named "Hex," along with dungeon names, new mechanics and the Velvet Room attendant . Atlus has never officially announced the game, so even its reveal schedule was written for it. The same batch surfaced Silent Hill: Townfall, Castlevania: Belmont's Curse and Dragon Ball Xenoverse 3 — none of them announced.
三、Analysis: Why Achievements Are the Worst Possible Leak
Platform backend data carries more weight than forum rumors
What makes achievement data different is its provenance. A forum rumor can be denied; achievement names are files publishers upload to Steam themselves, configured in advance with names, groupings and hidden entries. It needs no credibility check — one look at the data structure is enough. More subtly, achievement names frequently carry plot keywords: entries like "Desert Do-Gooder" for completing every request in the Star Wars world, or "May the Light Be with You," spoil by title. For narrative-driven Japanese RPGs, that is the worst possible leak vector. Steam has not commented, and the listings were later closed off.
四、The Risk Side: Free Marketing and Uncontrolled Spoilers
The gacha market: 132.69 billion RMB in H1, down 8.97%
Zoom out to the market. The China Game Industry Report for January-June 2026, published by the Game Publishing Committee and Gamma Data, puts China's game market at 188.45 billion RMB in H1, up 12.17% year over year — but the anime/gacha mobile segment came in at 13.269 billion RMB, down 8.97%, because long-running leaders declined and new releases failed to cover the gap. In July, summer spending pushed the total market back to 31.098 billion RMB, up 6.92%. The read-through: narrative-heavy titles like Kingdom Hearts 4 and Persona 6 are carrying not just player expectations but an entire segment's hunger for its next breakout. The leak cuts both ways — free buzz, but the ritual of a first reveal is spent a year early, and it is unclear whether the heat survives until launch. The reference case is 2022, when a hacker dumped early Grand Theft Auto VI footage and Rockstar ultimately pushed the game back and rebuilt its rhythm.
五、My Take: Players Won the Intel and Lost the Surprise
When I saw the Star Wars line in that achievement list, my first reaction was excitement — years of speculation, answered. Then it felt hollow. The moment of opening a game and discovering a world you did not know was there got spent on a string of text. The number worth remembering here is not 145. It is that the last line of defense for video game secrecy turned out to be a third-party achievement tracker, not a publisher's PR department. If you want to stay unspoiled, mute the keywords now. The official reveal is still at least six months out. Come discuss in the Gghubs comments.
六、FAQ
How many games did the Steam leak expose?
Counts differ: GamingBible tallied "at least 145" titles, while another outlet recorded 85. The set includes unreleased and never-announced games such as Kingdom Hearts 4, Persona 6 and Fable.
Which worlds leaked for Kingdom Hearts 4?
The achievements point to 10 worlds: Star Wars (Galaxy Far, Far Away), the Hercules Underworld, Toy Box, Quadratum, Scala ad Caelum, Savanna Central, Haunted Mansion, Monochrome Origins, Imagineer Planet and the Land of the Dead.
Will the leak change any release dates?
No official delay has been announced. Kingdom Hearts 4 still targets the second half of 2027 on PS5, Xbox Series X|S, Switch 2 and PC, and neither Square Enix nor Atlus has confirmed the leaked content.