I immediately paid the fair price to remove ads. Game is perfect for when you have a few minutes. It could use a little battery optimization, but it’s tolerable. Also it doesn’t remember your settings (you have to turn off sound each time, for example). Still, it’s a clever game that’s designed and monetized well, and I appreciate that. Like others have said, though, I wish you could move cards to an empty stack. It’s still fun though.