PSR is a group of Source Engine developers, currently focusing on Black Mesa: Hazard Course, an addon for the Half-Life reimagining Black Mesa.

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Five Nights at the Hazard Course

Five Nights at the Hazard Course

Black Mesa: Hazard Course Singleplayer Map 7 comments

Play the exciting "Five Nights at Hazard Course" map, based on the horror game series by Scott Cawthon and built for our 2015 April Fool's joke! [Though...

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