His dream is to build a roller coaster inside the house to move from one room to another :-) . For now using the available materials he built a small roller coaster. This design took nearly half a day for him to complete it successfully. Allowing them to do mistakes helps them to find better solutions for their problems.
https://www.youtube.com/watch?v=5I-PkswmsvA
https://www.youtube.com/watch?v=5I-PkswmsvA
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