My three year old son likes complex and chunky puzzles. They are hard to find. This is not his favorite but he likes it a lot (2nd favorite).It's very high quality. Good size, sturdy, colorful. It's nice to display when not in use. It is expensive, though.As far as complexity, it can be completed two ways - either showing numbers or roman numerals That makes the child look at each piece to make sure the chosen ("correct") side is facing up.
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