Well it's been about 10 years since my last 3D puzzle and now that I've assembled this astronomical tower nothing has changed. There is no pressure on the sides of the cut pieces, leaving you with little gray protrusions showing where the pieces fit together. The pieces are made of soft foam so each piece and piece can snap together if you push hard enough, a little more care is needed when putting the pieces together. I REALLY enjoy the "structure" details and how they are decorated. There's an attic and a door to the classrooms, which you can't see when they're done, but they're decorated! They cut out the parts you need, they print red dots on the parts you do NOT need, and give them to you for free! Once you've thrown away almost half of your pieces, you can start assembling the puzzle.
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