I’m not sure–but here is my thinking–the question of aligning the dots vertically or horizontally would be confusing for kids with limited experience (it may be confusing to more experienced people as well–although they might be more apt to try both and figure out what works best). However, if a heuristically driven approach to aligning the dots was set as the default, but there was also a button that could be used to override it, that would probably be ideal. Then again, I don’t know what work that would involve and it may be that for the vast majority of situations there is a heuristic that would work without needing a way to over-ride it. To be honest, I have never thought about this before!