According to reviews, it's as good as Lego and is interchangeable. After we assembled 3 pieces, one fell apart because the pieces didn't fit tight enough and had to be glued together to stay together. The second was missing some pieces in the bag and had to use some from another bag to complete it. And instructions are not as easy to follow as Lego instructions. I think you get what you pay for. Very dissatisfied with this product. My grandson lost interest after the third try and the rest just sit there. He usually finishes one very quickly and moves on to the next. He was very excited that there was so much to do but he did it after 3 points.
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