Opus Magnum

Definitely has the easiest campaign of a Zachtronics game that I've played. I really liked not being limited by space and having flexible inputs and outputs. This is really the evolution of the Spacechem formula and I thoroughly enjoyed it. There's a couple of mechanics that feel a little tacked on in the main campaign (one specifically jumps to mind) but it's not that distracting and the game itself is a triumph.