How to redirect the lasers in Testchamber 19 in Chapter 4?

Question

I'm stuck again, this time in Testchamber 19 in Chapter 4.

I've used the cubicle on the ground to change the angle of the laser on the right. I also know there's are cubicles to the left and right of where you enter Testchamber 19.

But I couldn't find a way to make use of Portals to get to get to those cubicles. So any hints as to what I should do next?

Asked by Ivo Flipse

Answer

• You have already obtained the first cube, which was on the floor.

• Obtain the cube to your left, at the ceiling you can place a Portal and then walk into a wall.

• Obtain the second cube by using the aerial faith plate. Place a portal above it and on the floor, then in mid-air fire another portal to where I aimed the cursor.

• Then, use laser chaining to open the door.

• Then, use laser chaining to kill the turrets and then raise the platform. After that you can use the aerial faith plate trick with the floor again and shoot a portal where I aim the cursor…

Answered by Tom Wijsman

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