Back in 2009, Ars wrote about what was being reported as a leaked trailer for the then-upcoming Left 4 Dead 2, saying the footage "looks like it’s straight from a high-gloss action movie." Today, we need to offer an important update to this crucial, 17-year-old story: The trailer "leak" was orchestrated by Valve itself.

That news comes courtesy of former Valve writer Chet Faliszek, who said in a newly posted video about cut lines in the game that "for Left 4 Dead 2 with the ESRB... we leaked our trailer ahead of time because they wouldn't let us release the trailer."

Faliszek is referring to the Entertainment Software Rating Board, the self-regulating industry group that, since 1994, has offered sometimes questionable age-appropriateness ratings for thousands of games submitted to its purview. While many smaller and/or online-focused game makers skip out on getting those ratings these days, at the time, any publisher that wanted space on major retailers' shelves needed to submit to the ESRB's standards.

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© Valve

Here at Ars, we're intimately familiar with data leaks surrounding Valve's games, hardware, and the workings of Steam itself. But nothing could have prepared us for this weekend's "terarelease" encompassing more than 12TB of content related to seemingly every title available on Steam between 2003 and 2013.

What's being sold as an "as-complete-as-possible ... content server dump" of Steam's defunct "Steam2" server architecture from that time period is now circulating around via a BitTorrent tracker that Valve seems unlikely to ever completely purge from the Internet. The massive collection includes thousands of "depots" representing what seems to be every version of every game uploaded to those old Steam2 servers. That includes public release builds, of course, but in many cases also covers previously unseen pre-release, prototype, and playtest versions of popular titles published by Valve and third-party Steam publishers.

Steam2: Electric Boogaloo

The reason this weekend's leaked content cuts off abruptly in 2013 is because that's when Valve updated its content distribution system from "Steam2" to the current SteamPipe system. In moving from a proprietary file distribution format to standard HTTP file trees, the new system removed various update approval bottlenecks on Valve's end and streamlined update and patch downloads so they only reflected file differentials.

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© Valve / HL_Alyx_NoVR

Valve’s latest SteamOS beta adds gamepad support for handhelds from MSI, Ayaneo, and Konkr while improving compatibility across several OneXPlayer and MSI devices.