My only experience of Left 4 Dead 2 is a handful of sessions in my youth where a friend handed me a controller (me, a person whose shooter experience extended to Ratchet and Clank at the time), told me nothing, and let the chaos unfold. I did not do a good job. But it left a lasting impression! Though perhaps that impression would have changed had I seen its cinematic trailer as soon as Valve had wanted to release it. The problem was, the Entertainment Software Ratings Board weren't so hot on the game, including its marketing materials, so that left Valve with one option: leaking the trailer themselves.

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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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