Thanks to @ractive 's great game 15-puzzle !
My little daughter loved it at first try, and playing with it recently. So, I rewrite it to make it flexable with various dimensions, smaller board for her, and bigger board for my elder daughter.
And then, I feel bigger boards a bit too easy, except the increased count of movings. So I add walls between them, which surprised me, it becomes much harder than I thought. Interesting.
Share with you who love it too.
@ractive hasn’t shown up for a long time, so open a new post here
BTW, we also love his Air Combat - a classic shooter, I remade it too, added many features, and will share it too in near future.