{"rewrite":{"id":"r_5b7edad9696a4a3eb5826b39","clusterId":"c_082732dd95397b7bd89fa0ce","slug":"fans-restore-valve-s-shelved-f-stop-prequel-from-leaked-steam2-data","model":"deepseek-v4-1-flash","headline":"Fans Restore Valve's Shelved F-STOP Prequel From Leaked Steam2 Data","summary":"Fans restored F-STOP, a Portal prequel Valve shelved, using assets from a 12TB Steam2 archive posted online on August 29. The archive carried most of the game's assets but not its source code or Source map data; a person who provided that data later surfaced in the Valve Cut Content community, and reports from players describe the result as almost 99% complete.","whyItMatters":"The restoration runs without Valve's permission, so the question now is whether Valve tolerates a near-complete build of a game it froze and never released.","webCardHtml":"\u003cp\u003eF-STOP was in development from 2007, after Portal shipped, and was positioned as a prequel. Valve froze it and released Portal 2 instead. Its systems stayed unknown for years until LunchHouse Software disclosed them in a December 2019 video series: an Aperture Camera copied and pasted objects in the world, similar to Superliminal. No playable build was ever made public.\u003c/p\u003e\u003cp\u003eThe August 29 Steam2 archive supplied most of the assets. The source code and Source map data were not in that archive, and the person who released them has not been identified. A moderator of Valve Cut Content said the initial map data provider asked for $1,000, but the data was released for free.\u003c/p\u003e","blueskyPost":"Fans have restored F-STOP, Valve's shelved Portal prequel, using a 12TB Steam2 archive posted August 29 plus source code released anonymously through Valve Cut Content. Players describe it as almost 99% complete. Valve has not given permission.","twitterPost":"Fans restored F-STOP, Valve's shelved Portal prequel, from a 12TB Steam2 archive posted August 29 and source code released anonymously via Valve Cut Content. Players call it almost 99% complete. Valve has not given permission.","threadsPost":null,"newsletterBlurb":"Fans restored F-STOP, the Portal prequel Valve shelved, drawing on a 12TB Steam2 archive published August 29. The archive held most assets but not the source code or map data, which arrived later from an unidentified provider in the Valve Cut Content community. The project is not believed to have Valve's permission.","attributionJson":"[{\"source\":\"Automaton\",\"url\":\"https://automaton-media.com/articles/newsjp/20261102-477115/\",\"title\":\"Valve's cancelled Portal prequel game restored by fans, thanks to leaked old Steam system and a \\\"mysterious data provider\\\"\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":5428,"outputTokens":718,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1793600956,"createdAt":"2026-11-02T06:25:43.000Z","publishedAt":"2026-11-02T06:28:04.000Z","updatedAt":"2026-11-02T06:28:04.000Z"},"cluster":{"id":"c_082732dd95397b7bd89fa0ce","canonicalTitle":"Valveがボツにした『Portal』の前日譚ゲーム、有志の手で復元される。Steamの旧システム漏洩と、“謎のデータ提供者”登場によって","representativeArticleId":"a_ba03d2a8a5814670b46e4c0d","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[\"Portal\",\"F-Stop\"],\"studios\":[\"Valve\"],\"people\":[],\"type\":\"news\",\"domain\":\"games\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-11-02T05:48:05.000Z","lastSeenAt":"2026-11-02T05:48:05.000Z","updatedAt":"2026-11-02T06:28:01.000Z"},"attribution":[{"source":"Automaton","url":"https://automaton-media.com/articles/newsjp/20261102-477115/","title":"Valveがボツにした『Portal』の前日譚ゲーム、有志の手で復元される。Steamの旧システム漏洩と、“謎のデータ提供者”登場によって"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":["Portal","F-Stop"],"studios":["Valve"],"people":[],"type":"news","domain":"games","is_roundup":false},"keyFacts":["F-STOP was in development from 2007 as a prequel to Portal before Valve froze it.","LunchHouse Software disclosed F-STOP's Aperture Camera gameplay in a December 2019 video series.","A Steam2 archive of over 12TB was published online on August 29.","The Steam2 archive held most F-STOP assets but not its source code or mapsrc data.","A Valve Cut Content moderator said the initial map data provider asked for $1,000 before the data was released for free."],"pageLinks":{"healthSlugs":["portal","f-stop","valve"],"storySlugs":[],"entities":[{"slug":"portal","supported":0,"disputed":0,"contradicted":0,"unverified":3,"overall":"unverified","story_count":4,"has_dossier":true},{"slug":"f-stop","supported":0,"disputed":0,"contradicted":0,"unverified":6,"overall":"unverified","story_count":1,"has_dossier":false},{"slug":"valve","supported":2,"disputed":0,"contradicted":0,"unverified":32,"overall":"green","story_count":42,"has_dossier":true}],"stories":[],"entitiesOk":true,"storiesOk":true}}