- Developer: Valve Software
- Publisher: Valve Software
- Genre: Action Shooter First-Person
- Release: Apr 19, 2011
- Platform: PC
- ESRB: Everyone 10+
There is a turret inside a ventilation grate just past the elevator in Test Chamber 16. Jump over it, get the Refraction Cube, then use the laser to destroy that turret to open the grate. Enter the new area to find four turrets singing a song.
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