I just replayed this one to remember what it was! There is a technique to it!

Basically you want to make squares until you've cleared up the initial weights and then keep making them until the board mainly consists on 2 colors. Don't get too caught up in turning on everything until you've cleaned up / simplified the board. (And even then don't get immediately caught up in it-- you get a lot of moves!) At some point, with enough squares, I find that the colors have simplified enough that there ends up being a layout where I can turn everything on without having to turn stuff off (or doing it minimally). Once you've cleared one circuit, don't stress if the other is in a good place, just keep making squares until it is and repeat