Well I once again bought a gift when it was on sale and when Christmas came and I gave it to my daughter it was no longer returnable. The instructions are hard to read. The slight color variations of the blocks make the instructions very difficult to decipher. The blocks themselves don't go well together. When we finished the first structure, the ball wouldn't stay in place and kept falling down. Bad design. I am very disappointed in this. I hoped it would be a great tool for learning physics and engineering. Instead, it's a frustrating jumble of blocks.
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