[eps]

Nah, that's too smart of a behavior. What exists now may have some edge cases, but it is otherwise staright-forward and intuitive. The only real "hassle" is swapping two large assembled pieces closer to the end of the game round, but it's not really a hassle. Not a big deal, really.

[paulhebert]

Yeah, I’ve heard that from a few people.

I’m thinking of adding a “shuffle” button to rearrange the tiles if you get really stuck. It’s theoretically possible to get in an unwinnable state where you can’t swap two tiles

[eps]

Perhaps do what you showed at the link, but only activate it on long tap-and-hold?

That is, if you hover a piece over some spot for X seconds, then it will shuffle other pieces out of the way.