Would it work with marbles if the little coaster car gets lost?

Sort of works for some track configurations. Marbles are faster than the car and jump the track easily.

is it too difficult for a 6 year old?

My son received it at about 6 1/2. He liked building with it for fun, but without the guiding cards. As he got more familiar with the pieces, he started trying the easier builds and really enjoyed it. I would say if your 6 year old is a builder and already completing Lego sets for older kids (8+), they would enjoy growing with this game. Hope that helps.

Can 2 sets connect together?

that is a great question! there is no scaffolding to connect the black bottoms but there is nothing preventing you from putting them side by side and attaching the pieces from one set into the next

For older kids, such as 5th graders, do you recommend combining 2 kits for them to have more pieces to work with or is 1 kit enough (won't be bored)?

Not really. This is a game, not a building set. You get cards that show you the puzzle and you have to "solve it" by building something that meets the build requirements (i.e. what shows on the card). So having more pieces won't do anything extra for those puzzles. Now, if you want to approach this as a builder set and just let the kids build what ever they want, then more pieces could be good. But I wouldn't recommend it.

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🎢 Think. Build. Conquer. The roller coaster of brainpower you can’t miss!

READY OUT OF THE BOX - No assembly or batteries needed—just dive into hands-on learning and excitement immediately.
SOLO PLAY INFINITE FUN - Perfect for independent play, encouraging focus and self-driven learning for kids 6 and up.
STEM LEARNING MEETS PLAY - Seamlessly blends science, technology, engineering, and math concepts into an addictively fun experience.
CHALLENGE YOUR MIND DAILY - Tackle 40 thoughtfully designed puzzles that sharpen critical thinking and problem-solving abilities.
MASTER THE ART OF ENGINEERING - Build intricate roller coaster tracks with 39 precision pieces that spark creativity and spatial skills.

Thinkfun Roller Coaster Challenge is a STEM-focused building and logic game designed for kids aged 6 and up. Featuring 39 track pieces, 36 posts, 2 tunnels, and 40 logic challenges, it combines hands-on roller coaster construction with brain-boosting puzzles. This single-player game requires no batteries or assembly, making it an engaging, educational, and ready-to-play experience that cultivates creativity, critical thinking, and problem-solving skills.

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RM491

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Product Dimensions	27.94 x 6.99 x 29.41 cm; 589.67 g
Item model number	1046
Educational Objective(s)	Creative Skill, Critical Thinking, Problem Solving, To Build
Language:	English, Japanese
Number of Game Players	1+
Assembly Required	No
Batteries Required?	No
Batteries included?	No
Material Type(s)	Plastic
Material Composition	Plastic
Remote Control Included?	No
Colour	Multicolor
Release date	7 Aug. 2017
ASIN	B071KT3MSN

Thinkfun Roller Coaster Challenge - Brain & Logic Building Game - STEM Toys for Boys & Girls Age 6 Years Up

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