Portal: Prelude Test Chamber 03
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- Go to the room on your left, after the Material Emancipation Grill.
- Jump over the pit and grab the upgraded Handheld Portal Device.
- Shoot a portal on the upper floor in the pit, and the other on the lower floor.
- Jump through the lower portal to reach the room entrance's level. Go back to the main room.
- Place a portal on the extended panel near the ceiling, and the other on a wall near you. Go through this last.
- Before touching the ground, put a portal under you. You should reach the first floor.
- Turn around, move forward and jump before falling. Continue to move forward while you are in the air.
- Before touching the ground, put a portal under you. If you do it correctly, you should reach the last floor.
- Go to the Chamberlock.
26. Slow Atmosphere 4 - 0:42 by ERH