# Valve’s Cancelled Portal Prequel F-Stop Has Leaked

> **Open Intelligence Dossier** · First detected: 2026-11-01 16:40 UTC · Category: Technology

## Executive Summary
4 news sources are covering this Technology story right now — PULSE is tracking how fast it spreads.

## Intelligence Brief
"Valve’s Cancelled Portal Prequel F-Stop Has Leaked" is generating significant coverage in the Technology category, with 4 articles from 4 distinct sources tracked by PULSE so far.


Outlets currently covering the story include iXBT.games, Tbreak UAE, The Verge and Kotaku. PULSE measures a story's velocity from how quickly new articles appear and how many independent newsrooms join the coverage.


This brief was generated by PULSE's extractive engine from coverage metadata only. The latest headlines from every source are listed below; the velocity chart shows how the story is developing in real time.

## Multi-Source Evidence Table
| Source Outlet | Headline | Verification URL |
|---|---|---|
| TechPowerUp | Fans Rebuild Valve's Scrapped Portal Prequel "F-Stop" From Three Separate Leaks | [Source Link](https://news.google.com/rss/articles/CBMisAFBVV95cUxOazF1dEhKNDZQYlVYNmxiMjd4eWZiY3BVM1B1ZDVPajQ1TGdjaWF0Tkl1M1N0WnZBdlZScms3X2Y3NFZRODluT3pSVFg4Znl4Wm81Z0xLU2FIUnAzR0lRd0ZVUmU1aW5BNXdnTHk0bDQzeW1IUHhMbEN2YVNBU09OWmVPaWk0cTV2YTRJdWNjVnQtZVVtbmZEa0hrUmo4M0E5czhEb2RONWk5aXpROHFUMw?oc=5) |
| shattered.io | Portal Prequel F-Stop Leaks at 99% Complete [2026] | [Source Link](https://news.google.com/rss/articles/CBMihgFBVV95cUxPb21CMEFSS0syZmpZMEJyc2dUNTBVRU1qRjUwZmNkeE82Y1pMOUlLQWIxSWtPbFlaazlia244YUdmMjNyR0lEZmpNbTJFYlYtY0ZHdHlvWUFKTEtSQW5IbUtPa1NVTmpDWFpaQmg2QkNWSVBIdE9lbHFyQVZSSUYzQ09QclBjQQ?oc=5) |
| TechPowerUp | Fans Rebuild Valve's Scrapped Portal Prequel "F-Stop" From Three Separate Leaks | [Source Link](https://news.google.com/rss/articles/CBMisAFBVV95cUxOazF1dEhKNDZQYlVYNmxiMjd4eWZiY3BVM1B1ZDVPajQ1TGdjaWF0Tkl1M1N0WnZBdlZScms3X2Y3NFZRODluT3pSVFg4Znl4Wm81Z0xLU2FIUnAzR0lRd0ZVUmU1aW5BNXdnTHk0bDQzeW1IUHhMbEN2YVNBU09OWmVPaWk0cTV2YTRJdWNjVnQtZVVtbmZEa0hrUmo4M0E5czhEb2RONWk5aXpROHFUM9IBtgFBVV95cUxOQ3hQTE1NSE14WXZMOXlrV0JvclpKcFUzbkVfU1dSYW42TUNxT1llN1JfU1VpTWxFbHUtU3NNNW04aDRIdElXZWZrYTY3U2N6YWEzYjdSeTQwUVZmeFRMeHZDZi12V1dHSkVJeG9GWFpNTElpaGFTaTNHbTFoRDZZTXFIY29Sb0dZNmZyQVdzdnYwZ003U1EtbnJCU1o0WFhWNDR) |
| Yahoo Tech | Valve's long-lost prototype Portal prequel appears online after nearly 20 years | [Source Link](https://news.google.com/rss/articles/CBMikAFBVV95cUxPZVJaR1luOVIzMmREaHgwdFRuemNMTE5lVnMxWlNsZ1lBZHJwRGtEWTNSR2pfX1NkZXVlX3V6anRlQ3g5VmJVZUVXdWg4X3cwSnBibEc3UG16Y0JxVDR0dGl2RXN6a1R5QmtRSDdDTHlQYnVHRk5KS20wTkl5OVFWeHNqTlhwSmN6a3FZUXRNT3c?oc=5) |
| Rock Paper Shotgun | What remains of canned Portal prequel white whale F-Stop is now fully playable thanks to modders and some big leaks | [Source Link](https://news.google.com/rss/articles/CBMi4gFBVV95cUxQUDRuN0pITEZWeGxvT1JBd2xYLWN1bDdnOXVUNksxel9pd0pXMVlaNGNLNWo4VFE5T3poOEFVX1FuZ3hxNkc4clhwZDVuXzk0aHd2cFAxMmpnV0hYd0NzNnA3a0o5Nml1QnFOcGRkUjBkSDRKb1BFZEk2SFV6WVJPWWw2MUFUdC1yNXNSNF9jWUNMOHFKVlFiRFdpaGIwZnNZc1lQbU5vMXprSTJLZFMwUFRvVHpsWjlMWS1VZUdISXZIRU56WXMwTHdqWER4NFphd2NFRW1IWjZfOE5fRUtKd3ZB?oc=5) |
| Engadget | All The Leaks For The Portal Prequel F-Stop Have Been Compiled Into A Playable Game | [Source Link](https://news.google.com/rss/articles/CBMiuAFBVV95cUxNak45dzQ2d2lRbW53YmVQUUI5U1l2LU1uR0xhUHgzQUZ2b254aFhsZWx0eGRxaFNCbndmRzVWVHZjbFJ5UTY3MllGdzF5aTV3SHNJUVhwRW5tbU1DYkViZ2pjSUlLSXQwVEh3bmpMQm9QTldLb2pkdzNvUEdHMTFQb3ZzRDh0MDBCZlpyY3BnM3l0ZFcybHhHSXNGN3FLcXJxSV9hNFFZdDlaTGx2bkZRX1JOeGk2MUNH?oc=5) |
| PC Gamer | Valve's long-lost prototype Portal prequel appears online after nearly 20 years | [Source Link](https://news.google.com/rss/articles/CBMiswFBVV95cUxOMkMtNVlzSEUxckhRVTVQSnBrT0NZal8tanA3S1FVQnpDTEhHWjg0QWFhUU53SGNiYjZOUWx1bTVlRzlxUzRiUTZWNEhiZG43Qy1yTFVFejFCcUN5cUstOWhtdzFxb3RuNHpXb2ZYNnJiTWF4YTZrcm1ERzllR0dNVlg2MldDcUZ3TkxaZS0zdVVLREFwb084MFNDUnBfVUZiYTVuZzN2clhDekRtTDJScG94TQ?oc=5) |
| iXBT.games | Maps from F-Stop, the cancelled Portal sequel, leaked from Valve | [Source Link](https://news.google.com/rss/articles/CBMingFBVV95cUxNbFIwbWhnc0NicU9DZk1USlVpX3BFb0hTa0EyU2xFbkVmUFJqU2J3amZRRWxyZFBQcUJCTVZGUGM5RGF2aFZyb21zUDdhbXZXb0w2a0tzWGVBTm5DVnNfd3N3UUZ1ZVNodUZ6U3d0TGZCNGZCRWFFZnF0OXhXOXU3Y29rMGxLd2tJa1VFMWF1a3YySjBfQ1JhOEx2aWQzUdIBowFBVV95cUxPS3ZpR24xa2hYLThsbjVLeGJiekFPTjVNX1BrR2ZWVFk1LXMzNjlaUi0xcDRRYjdWWGV5cmdVejVSSHBOakRkVWZ3NV9xSm5rQjB3NDMtaThCSFljUE8tbzRhRWt3dWFlbDdMZnhWOGlNOUlMd2stUTJ6bkJoRl9GcUNLaHBjODhBY0RHOEdwNDl0VS12YXlyTHR2R09FLXpGcWQ0?oc=5) |
| Tbreak UAE | Portal Prequel F-Stop Leaks in Fully Playable Build | [Source Link](https://news.google.com/rss/articles/CBMiWkFVX3lxTE5HcXZDVEVUOHlfTlJ5YVR3dm5abDMyM3FlOFF2clNoMzNJX2NLbEc3aWpjT0laTkRHLXVHWE5yRmlIVnRZdDRKeUlKQ2tLSnlVM1V4N0NYRVZkQQ?oc=5) |
| The Verge | A fully playable version of Portal prequel F-Stop leaked | [Source Link](https://news.google.com/rss/articles/CBMif0FVX3lxTE1zSlZxQ29SQXZCTmcyc002RnVuZkM2ZUVZZk5ReERlVEplOFE0SFNZM2oxMVdqVWZNZ2FUWWUybUFLQ1l5UTJPdlJ2Y2FMU1FGRENUWm5VTlUtdGV4ZW13Z3hHb1JvU3lHcWdCaTNjcXNoVHZLX3BlT1VzZ3ptTnM?oc=5) |
| Kotaku | Valve’s Cancelled Portal Prequel F-Stop Has Leaked | [Source Link](https://news.google.com/rss/articles/CBMihgFBVV95cUxOaUFNcjZ4ZlMxTnY3YUw4SFVDZWNmRWgxNTVpcGw4aGtJTzZKNFlQZWd6TkhnZldTbFpRaDFHdGlDa0lJZHA1eW5VLThOelM0d1NQYmZiYjl5bTNacXVUNHJMUjRvS05ESzBubDdVU2ptYUZoVmFyZkxpNDZPbndUQUF3TnNRQQ?oc=5) |

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*Canonical Source: https://pulse.byoviral.com/trend/2026-11-01/valve-s-cancelled-portal-prequel-f-stop-has-leaked*