Portal 2 Chapter 4 Test Chamber 21
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sp_a2_bts1.bsp Jail Break
This is the thirtieth level of the game, and the final part of Chapter 4. This level is set within a Test Chamber and the maintenance areas of the Aperture Science facility. This level advances the central plot, and does not contain any significant Portal-related challenges.
sp_a2_bts2.bsp Escape
Hazards
Walkthrough
Intended Chamber Solution
- Place a portal on the wall where the Hard Light Bridge ends and the other one on the left side of the exit.
- Go through the portal and push the Switch.
- Continue to walk to the cube.
- Put the cube on the button.
- Use the portal again to proceed to the chamber lock.
Actual Course of Action
- Wait for Wheatley to open the wall and run to the Maintenance area.
- Run to the left and continue forwards.
- Turn right on just before the catwalk ends.
- Turn left and jump down. Continue by to the right up the stairs.
- Run forward as much as you can. Turn left and continue running.
- Jump down on the left side.
- Use the Bridge and run away from the Chamber until the Bridge disappears.
- Turn to the opposite direction and continue running.
- Jump from the catwalk to the area between chambers and run forward until you get to the wall.
- Pick up the turret and knock over the turret behind it.
- Turn left and go behind the tube and knock over the third turret.
- Let go off the turret (make sure it gets knocked over).
- Open a portal on the wall near the third turret. Shoot the other portal behind the panels where the third turret is. Go through the portal.
- Run to the right and follow Wheatley until a turret is revealed on the left.
- Get rid of the turret by using a portal and continue following Wheatley. Enter the elevator at the end of the catwalk.
- Wait for the elevator to stop and go through the door.
Video walkthrough
Download demo files: 
Part 1 – Part 2
Related achievements
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SaBOTour Make a break for it |
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Good Listener Take GLaDOS' escape advice |
Trivia
- If you take too long to escape the test chamber, GLaDOS will fill the room with neurotoxin.
- If you fall for GLaDOS's attempt to trick you back into testing, she traps you and fills the room with neurotoxin.
Music
An Accent Beyond by Aperture Science Psychoacoustics Laboratory [2:58] | Download | 
Play
Gallery
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Test Chamber 21
Transcript
GLaDOS: I've got a surprise for you after this next test.
GLaDOS: Not a fake, tragic surprise like last time... ... a REAL surprise with tragic consequences.
GLaDOS: And real confetti this time.
GLaDOS: The good stuff - our last bag.
GLaDOS: Part of me's going to miss it, but at the end of the day, it was JUST taking up space.
[LIGHTS TURN OFF]
GLaDOS: What's going on? Who turned off the lights?
Wheatley: Hey, buddy!
Wheatley: I'm speakin' in an accent that is beyond her range of hearin'. I know I'm early, but we have---
GLaDOS: Look, metal ball - I CAN hear you.
Wheatley: Run - I don't need to do the voice - RUN...
Wheatley: RUN!!!
Wheatley: Come on, come on!
Wheatley: RUN! Come on! I'm closin' the doors!
Wheatley: OK, quick recap: we are escaping! That's what's happening now: we're escaping. So you're doing great. Just keep running!
Wheatley: Err, quick word about the future plans that I've got in store.
Wheatley: We're gonna shut down her turret production line, alright, turn off her neurotoxin, and then confront her.
Wheatley: Again though - for the moment - RUN!
Wheatley: This way, this way.
GLaDOS: The irony is you're almost at the last test.
GLaDOS: Here it is. Why don't you just do it? Trust me, it's the easiest way out than whatever asinine plan your friend came up with.
Wheatley: Whaaa? How stupid does she think we are?
Wheatley: Oof.
Wheatley: This way, this way.
Wheatley: Come on, come on!
Wheatley: WAARGH!
Wheatley: What's going on in there?!
Wheatley: Can you--- can you get out?!
Wheatley: We HAVE to get you out of there!
Turret: (Who are you?!)
Wheatley: Try to make your way back out here!
Turret: (Malfunctioning!)
Turret: (Shutting down.)
Wheatley: I heard gunfire! A bit late for this, but look out for gunfire! Probably doesn't help at this point, but I have at least tried.
Turret: (Awww!)
Turret: (Why?)
Turret: (WHEE! OW, OW, OW, OW, OW!)
Turret: (I don't blame you.)
Wheatley: You're OK! Great, come on!
Wheatley: This way, this way.
Wheatley: Turrets!
Wheatley: Go, go, go, go.
Wheatley: There's the exit! We're almost out of here.
[TESTCHAMBER MOVEMENT]
Wheatley: She's bringing the whole place down. HURRY! HURRY! This way.
Wheatley: GET IN THE LIFT! GET IN THE LIFT!
Wheatley: We made it, made it, made it, made it.
Wheatley: I'll meet you on the other side!