Opus Magnum gets my vote for "best introductory Zachtronics game" - very polished, simple concept, and you can almost always brute force problems rather than be

Opus Magnum gets my vote for "best introductory Zachtronics game" - very polished, simple concept, and you can almost always brute force problems rather than be super precise so there are no real "puzzle of death" moments where you just can't figure something out. Many of the other games build to a level of difficulty that I find drives people away around the mid-point. There's some significant mental leap you need to make, or you need to cram things into an impossibly small space, etc. Opus Magnum is a lot more forgiving in that sense.