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.
- 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.
- In the version 1.0.0, the turrets are functional even before the acquisition of the Handheld Portal Device.
09. ABS O5 120 Harp - 1:09 by ERH