[[Phill]]

23 can be done with two potals.

First set up a portal to the right where the orb is spawned and then move it so it is bouncing vertically near the middle of the lower leve.

Then spawn a portal in line with its home on the top right and put the other end of the portal on the bottom of where the orb is now bouncing vertically.

Drop through the portal onto the button, then the orb will closely follow you, make it down to the home and you are out.