You'll need a lot of thought to transfer the cubes from one place to another. This puzzle is not a long one, but it will take some thinking. Cubes, buttons, tractor beams and lasers are used to navigate through, but transfering the cubes from one chamber to another is tricky. One reflector cube, and one standard cube are used all the way through.
Edit: The puzzle has been edited to include a fizzler field located just after the player enters the upper level. This means only the "player" can enter the upper level and nothing else. Some of the walls in the upper level have been pushed back to ensure good visibility of the first tractor beam. Game-play and solution remains the same. Thanks RectorRocks for finding that.
Here is the video play-thru in case you're stuck or maybe banging your head on the wall.



. If you watched the video I included, you'll see what I mean. That tunnel is in case the player messes up and needs a way back down to the first level. I could remove that "jump-down" tunnel to prevent that, but the player might get stuck.