Ground floor solution:

Jump the laser around using the cubes on the buttons, on the last button you need to fire the laser upwards through the ceiling hole. It can be a bit tricky aiming it upwards, that it why there is a button there, to make things easier. You DON'T use the laser catcher/relay at this point of the map and, at this point, you'll only use 3 cubes out of the total 5 on this level.

Okay, I have to give up. Is the hole you mention above the button behind the laser grid? If so, I knew about that one, and I see no way forward. If it isn't, I peered at the others (I even noclipped to see) and, nada... Sorry, but I can't seem to figure it out.

d'oh!!! And, I looked... darn it. Okay... I'm going back in :)

Hint for the first floor: There is a hole in the ceiling over a button

It is not as immediate if one's not paying attention

I need a hint. I'm sure I'm missing something, and I'm on my 3rd try... Without getting out of the first level... I got the laser grid to go away, and put cubes into the three cube boxes but that's as far as I can get. Am I just being an idiot and missing the obvious?

v3.0 change log:

Major changes:
– changed the first lift for a funnel
– added a faster backtracking route, should anyone misuse their portals.

Minor tweaks:
– made the necessary changes to accommodate the new funnel
– some connections have been removed or moved around, it order for all the antlines to be drawn on the map

Previous version (v2.1) link:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=72966422