Valve employee Tristan Reidford may have inadvertently confirmed the existence of Left 4 Dead 3 in a recent tutorial video.
Reidford, who was making a video showing how to import source engine assets into the Destinations platform, had a Left 4 Dead 3 folder in full view.
The image above was quickly swapped out for one without the folder, seen in the top left of shot.
Left 4 Dead 3 is rumoured for a 2017 release.
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