Locked from Inside (green)
Open all available doors with the connector and get another device. Guide the blue beam near the last door.
Link the receiver found at the beginning with the red transmitter using the red connector. Set the blue connector like on the picture.
Trapped Inside (green)
Link two connectors to open the last door. You can't lose connection with the transmitter. After that, the road to the sigil will be clear.
Windows into a Labyrinth (red)
Get the jammer by opening the door with a connector. The jammer will allow you to open doors unavailable when using only the connector. Go further and open the red door by transmitting the beam through the window. Get another connector.
Open another door with the connector and always use the jammer on those doors in case of disconnection of the laser beam.
Guide the laser beam to the penultimate door while keeping the jammer for opening the last door before the sigil.
Pinhole Windows (red)
Release the blue transmitter with the help of red beam, then take two connectors.
Place the red and blue connectors as on the picture. The blue beam must stay in the middle so that it won't intersect with the red one. This way the path to the sigil will be open.
Two Pesky Little Buzzers (red)
Open the red door with the connector before the metal ball intersect with laser. Then take the hexahedron and use it on one of the balls.
When one of the balls will be stopped by the hexahedron, you can carelessly guide the beam from the transmitter at the beginning of the level. After a few seconds, the doors will open.