How do I get out of Chamber 17?
Solution 1:
You need to drop the cube while standing on the platform. The platform will be down while the cube is blocking the beam.
- block beam with the cube (on top of hard light)
- step on the platform
- make cube drop by redirecting the hard light
- beam will activate the platform, which will get you to the exit, cube will open exit
Solution 2:
With pictures (for fun)