How to Make a Homemade Roller Coaster with Marbles
- Creating a homemade roller coaster with marbles is a fun and challenging engineering project. It requires various materials, including track pieces, supports, and of course, marbles. The coaster can be made from scratch using blueprints or a kit.
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مستشار بيع : السيدة لوسي |
مستشار البيع : السيد مارك |
