Not bad, took some thought.

Nice update! And great trick learned...! Always love turrets party!
If you can, please try my last one ! Thanks.

daloboy: thanks for finding these. Updated the test chamber to eliminate 2 cube solution to room 1 and 1-cube solution to room 2.

The picture does match what you played, the 3rd room just isn't visible from that angle, being behind the 4th

You may want to try the first 2 rooms before reading the spoiler below, because the same hint will help on all three rooms.

A laser can pass through a portal more than once

Hi qlipoth. I do the first room with two cubes. Then the next one with only one, but even with four cubes, I don't see how to do the last one! Any pointers? I noticed that the picture above doesn't exactly correspond to what I played. Here a picture of the third room. Thanks.