*Walk over to the Beams and place a portal on the wall on the left-side where the Beam ends.
*Place the other portal to the column facing the three Receptacles.
*Pick up the [[Discouragement Redirection Cube|cube]] that is already redirecting one of the Beams. Place the cube in front of the portal, so the Beam activates the middle Receptacle.
*Pick up the other cube and place it over the beam coming from the ceiling. Aim it at the Receptacle on the right side.
*Go to the [[Chamberlock]].
}}
== Video walkthrough ==
== Video walkthrough ==
Revision as of 20:15, 22 July 2011
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Chapter 4 - Test Chamber 20
sp_a2_triple_laser.bsp
This is the thirtieth level of the game, and is the first level to be set within a fully-repaired and functional Aperture Science Test Chamber. This level requires the player to combine precise Portal-placement and multiple Thermal Discouragement Beams in order to proceed.
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