Portal: Prelude Test Chamber 01
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This Test Chamber is the second level of the game, and introduces the player to the single-Portal variant of the Aperture Science Handheld Portal Device, the Turrets and the Moving Panels.
Test Chamber 01
level_01.bsp 
Hazards
Walkthrough
- Wait for the portals to open.
- Go through the portal, then take the single-Portal variant of the Aperture Science Handheld Portal Device.
- Wait for the new portal to open.
- Pass through the portal and go quickly behind the Turrets.
- Disable the turrets and then go to the Chamberlock.
Video walkthrough
- To do