A Valve API blunder overnight turned Exophase and SteamDB into accidental spoilers machines, surfacing achievement lists for dozens of unreleased and unannounced titles. Kingdom Hearts IV's list points to worlds including Star Wars' Galaxy Far, Far Away, Zootopia's Savanna Central, Haunted Mansion, and others beyond the already-confirmed Coco Land of the Dead, while Persona 6 achievements reference Yokohama settings and narrative beats Atlus has kept tightly under wraps.[[1]](https://kotaku.com/kingdom-hearts-4-disney-worlds-coco-zootopia-star-wars-2000732471)[[2]](https://www.gematsu.com/2026/09/persona-6-kingdom-hearts-iv-and-other-steam-achievements-surface-in-large-scale-leak)
Site owner Mike Bendel (x3sphere) traced it to a Steam-side screw-up where private achievement data became publicly queryable through the API, not any breach on Exophase's end. At least 30+ titles popped up, mixing confirmed projects like Fable and Gears of War: E-Day with placeholders for unannounced or possibly canceled efforts, and the lists keep expanding as more AppIDs surface.[[3]](https://www.videogameschronicle.com/news/huge-steam-leak-shows-achievement-lists-for-hundreds-of-upcoming-games-including-kingdom-hearts-4-and-persona-6/)[[4]](https://www.polygon.com/kingdom-hearts-4-worlds-spoiled-steam-achievements-leak/)
Reddit threads and X are flooded with users trading warnings and partial parses, some already muting keywords to dodge further damage. Valve has stayed silent, and publishers including Square Enix and Atlus have no public comment yet. The real story isn't the spoilers themselves—it's how a backend maintenance bug exposed years of controlled reveals in one API slip.[[5]](https://www.reddit.com/r/Games/comments/1wb9z8v/persona_6_kingdom_hearts_iv_judas_stranger_than/)
