There is a bug that lets me use the same piece regardless of the number beside the piece times if I don't click off it.
If I remember, the bug can be exploited by continuously spinning the piece. Other than that, I got to level 16 (without walk-though) before I found the bug.
Per puzzle, it usually took 2 tries (if not 1). I really love the idea of having put the right pieces, at the right places, in the right rotation, and in the right sequence. It would've been too easy if I could 180 rotate the pieces sideways. 5/5 stars for use of tetris and concept (-)1/2 for bug= 4.5