Portal: Prelude Test Chamber 09 (Advanced)
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This is the second advanced Test Chamber of the game. This version is unlocked when the original Test Chamber 09 has been completed. It as the extra challenge such has a harder Infinite Jump, less white surfaces, a faster Suppressor Field and the removal of the supplementary ledge.
Test Chamber 09 (Advanced)
advanced_09.bsp 
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Hazards
Walkthrough
- Place the portals on the only portalable surfaces on the floor.
- Jump through the lower portal. Just after passing through, move in the air to go through the same portal. You will gain more momentum. Repeat this if necessary.
- When you are high enough, shoot a portal on the concrete section of the floor behind the glass, then go back in the room entrance.
- Fire the other portal on the lower level, then jump through at the good time to avoid the Electricity Field.
- Run across the Electricity Field quickly and jump over the little gap.
- Go to the Chamberlock.