Wow, the pieces included in this set give you the opportunity to choose 4 different paths that you can't do without this set. I wish I knew how to attach a video to show how cool it works. This is a game changer as it reduces the need for those tiny supports. We've used up all of these pieces! Aside from being able to stretch your balloon, the other items in the set are amazing. You need a jump. You need roller coaster tracks. You NEED this set. When you buy Marble Genius you know you are used to quality. These kits are a bit more expensive than the cheaper version but honestly they are worth it. Don't make me say "you get what you pay for". Just got back to Revain to buy another set so we can expand the sets even more and thought I'd let you know if you should buy this one. We have several other Marble Genius addons and this one offers the most entertainment and educational value.
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