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Published on Jul 18, 2010
This is the Portal trailer, released through Steam on July 18, 2006.
It is presented as an in-universe video titled "Orientation Video no. 1 - A Safe and Healthy Environment". Unfortunately, despite the number, no more Orientation Videos followed.
It includes tracks by Kelly Bailey. ("Guard Down" from the Half-Life 2: Episode One soundtrack, "Vortal Combat" from the Half-Life 2: Episode Two soundtrack, and "4000 Degrees Kelvin" from the Portal soundtrack)