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Part 23
Portal

Part 23

Portal Part 23 walkthrough: Navigate fans, catwalks, and pistons to find commentary nodes and progress through the facility.

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Portal Part 23 walkthrough: Navigate fans, catwalks, and pistons to find commentary nodes and progress through the facility.

Walkthrough
  1. 1
    Approach the door and press use to open it.
  2. 2
    Go through the door and approach either fan.
  3. 3
    Shoot a portal through the fans at the walls behind them.
  4. 4
    Face the water and shoot a portal at the far wall, high above the catwalk.
  5. 5
    Go through the portal near you.
  6. 6
    Look back across to where you just were to see a catwalk on the other side.
  7. 7
    Shoot a portal high above it on the opposite wall, then another at the wall near you.
  8. 8
    If you shot the portal high enough on the wall, you can walk through (holding forward) and land on the catwalk.
  9. 9
    Turn right to see an open door and go through.
  10. 10
    You can look through the window to see a presentation about Black Mesa or go through the far door to look down on Test Chamber 09.
  11. 11
    Head through the nearest door to see Test Chamber 14.
  12. 12
    Head back out, walk across the catwalk, then go down the stairs.
  13. 13
    Look at the wall opposite the stairs you just came down and shoot a portal at the far right of the wall.
  14. 14
    Shoot a portal at your feet, and while falling, shoot another at the ground where you would land.
  15. 15
    You will end up above the stairs you just came down from; run forward.
  16. 16
    Go up the stairs, then up the next set.
  17. 17
    Jump over the railing and then into the hole in the pipe.
  18. 18
    Once you land, jump down into the cylinder.
  19. 19
    Go behind the energy grid.
  20. 20
    Stand on the button, then shoot a portal through the door that opens.
  21. 21
    Shoot the other portal elsewhere and go through.
  22. 22
    Jump down the hole where the elevator should be.
  23. 23
    Shoot a portal at the "ring" of white that you are standing on.
  24. 24
    Look towards the chain link fence to find a low ceiling that has shootable space on it; shoot one there.
  25. 25
    You will have to duck down to get out of the portal.
  26. 26
    When the pistons get low enough, get on the farthest piston.
  27. 27
    Ride it to the top then shoot a portal at the top part of the "ceiling" you just came out of.
  28. 28
    Go back through the portal on the ceiling.
  29. 29
    When the piston goes back towards you, jump onto it to have it take you to the other side.
  30. 30
    Jump onto the platform.
  31. 31
    Crouch down and approach the grate at the end of the hall.
  32. 32
    Shoot a portal through the grating.
  33. 33
    Retrace your steps to the place where you jumped onto the piston.
  34. 34
    Jump through the portal here.
  35. 35
    Once you land, look up to see a hole in the wall that leads to a hallway.
  36. 36
    Shoot a portal at the wall opposite, then jump through the portal that you just came out of to land there.
  37. 37
    Go around the corner.
  38. 38
    Continue here until you get to a split; head forward as there is nothing useful to the right (up the stairs).

Commentary Nodes:

  • One is floating near the window in the nearest room (after the first catwalk).
  • One is on the button behind the energy grid.
  • One is behind the middle piston in the large room with lots of pistons.
Tips
  • Use portals to redirect yourself across large gaps and to reach higher platforms.
  • Be mindful of where you place portals, especially when falling or navigating moving platforms.
  • Listen to the computer's dialogue for hints and context.

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