Excellent, could use a tweak.
As others have said, the game is a bit punishing when you make a mistake. Maybe you could allow a limited number of "undo" moves each level? As it is, Im only really comfortable playing Zen mode so I can think my way through each round before I make a move.
That being said, this is a fantastic game. I love how in the higher levels theres more than one solution to be found. Also, the animations are great. Its oddly satisfying dragging the numbers around.
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