Valve accidentally compiled and pushed earliest Left 4 Dead prototype called "Terror Strike" into the latest CS 1.6 update and community figured out how to play it.
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https://twitter.com/gabefollower/status/1727585163981340974
https://twitter.com/gabefollower/status/1727585163981340974
Not to mention the Steam Deck lit the fire under the asses of all the other manufacturers, if they weren't already developing handhelds. Quite a positive price and technology chain reaction.