This is the thirty-first level of the game, and the final part of Chapter 4. This level is set within a Test Chamber, and later the maintenance areas of the [[Aperture Science]] Facility. This level advances the central plot, and does not contain any significant [[Portals|Portal]]-related challenges.
== Hazards ==
== Hazards ==
*Toxic Water
*[[Goo]]
*[[Turrets]]
== Walkthrough ==
== Walkthrough ==
Revision as of 00:50, 22 July 2011
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Chapter 4 - Test Chamber 21
sp_a2_bts1.bsp
This is the thirty-first level of the game, and the final part of Chapter 4. This level is set within a Test Chamber, and later the maintenance areas of the Aperture Science Facility. This level advances the central plot, and does not contain any significant Portal-related challenges.
Part 1 – 
Play
