Much to be desired
From the picture, it looks like this app is for kids. However, one is expected to build the puzzle by looking at a small diagram on the left. There is no structure in which to place the pieces and when the pieces are placed correctly they do not 'lock' so that when another piece is moved onto the picture, the large circle used to rotate the piece overlaps with the other pieces and moves them out of place. My son and I became very frustrated very quickly.
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