This page contains Half-Life Hints for PC - Windows called "Hidden area Under the map" and has been posted or updated on May 29, 2013 by Gordon Freeman. Let us know what you think of this Hint by thumbs voting.
Hidden area Under the map
When your going inside the Test Chamber, type sv_cheats 1 in console and noclip to activate no clipping mode then go under the test chamber then you will see 4 blinking green rectangles and those rectangles is where you will go after your hit from the Laser of the Anti-Mass Spectrometer
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