Portal Escape (Part 1)
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Portal Escape (Part 1)
testchmb_a_15.bsp 
This is the twenty-first level of the game, and takes place outside Test Chamber 19. The player must utilise Flinging and precise portal placement in order to proceed.
Hazards
Walkthrough
- Wait for the Unstationary Scaffold to move closer to the Incinerator. Fire a portal on the wall ahead but make sure the portal is above the handrails.
- Place a portal on the wall nearest to you and jump through that portal.
- Turn around and shoot a portal as high as you can on the same wall. Put the other portal on the center of the floor and fall through.
- Run to the left until you reach a place with a set of stairs and a catwalk.
- Fire a portal on the wall above the catwalk. Place the other portal on the floor and go through.
- Go through the door on the wall to get in the room. Go up the stairs and go to the end of the catwalk.
- Fire a portal behind the fence and the put the other portal on the wall next to you and go through.
- Go through the door and walk forwards. Shoot a portal on the wall behind the huge fan on the left and place the other portal on the floor and go through.
- Turn to face the area above the Goo and fire the other portal on the wall ahead. Go through the portal.
- Walk to the door on the wall on the left. Fire a portal on the wall next to you and the other portal on the wall above the catwalk. Run through the portal to get on the catwalk.
- Head for the other end of the catwalk and go down the stairs. Fire a portal on the floor and place the other portal on the wall above the platform higher up. Go through the portal.
- Shoot a portal in the corner facing the broken catwalk. Put the other portal on the floor below yourself and jump through.
- Go up the stairs and jump over the handrail into the broken transportation tube.
- Wait for the end of the ride. Then jump down to the test chamber and walk past the Material Emancipation Grill.
- Go stand on the button and fire a portal on the wall through the opened door. Place the other portal near you and go through.
- Head for the elevator shaft and jump down.
- Shoot a portal on the floor and put the other portal on the white surface behind the fence. Go through the portal and duck.
- Walk towards the two moving pistons and go stand on the one that goes higher up. Wait for the piston to be extended and then fire a portal on the surface above your last portal.
- Go back to the portal you've placed before and jump through it.
- Wait for the larger piston to start extending and then jump on it. Go to the area at the end of the piston.
- Turn left and fire a portal through the small hole. Wait for the piston to extend again and then go back to your portal.
- Go through the portal and place a portal on the wall opposite of the portal next to you. Jump through the portal.
Video walkthrough
Related achievements
Portal
 |
Partygoer Make the correct party escort submission position decision. |
Portal: Still Alive
 |
Tests Like Chicken Find the chicken's test results. |
Music
Main article: Portal soundtrack
4000 Degrees Kelvin by Valve Studio Orchestra [1:01] | 
Download | 
Play
Stop What You Are Doing by Valve Studio Orchestra [4:00] | Download | Play
Trivia
- There are rooms accessible in chamber 19 that are looking out over parts of test chambers 09 & 14
- The test chamber you end up in after riding the cube dispenser tube is Test Chamber 09.