This was really cool. Challenging for sure on the first try I got one star. It challenges your ability to play around with it. I think the tutorial clicked for me when I saw the black shaded areas appear and they were mirror images of the red, then I got the game. With a small tutorial that this is the operation triggered by swiping would be useful. Though I did enjoy the aha moment when I got it.

When do the puzzels get updated? It makes sense to add a time zone. I’m definitely going to take another go tomorrow.