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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🎢 Build brains and thrills—ride the wave of STEM fun!

HANDS ON ENGINEERING FUN - Half logic game, half roller coaster set—build thrilling tracks while developing spatial reasoning.
INSTANT PLAY ZERO HASSLE - Clear, high-quality instructions mean you start solving puzzles and building within minutes.
AWARD WINNING EDUCATIONAL TOY - TOTY Game of the Year Finalist recognized for blending fun with skill-building.
MASTER STEM LOGIC WITH EVERY BUILD - 60 brain-teasing challenges from beginner to expert keep your mind sharp and engaged.
PERFECT GIFT FOR FUTURE INNOVATORS - Trusted by families worldwide, designed for kids 6+ to spark creativity and STEM passion.

ThinkFun Roller Coaster Challenge is a STEM-focused building and logic game featuring 60 progressively challenging puzzles. Designed for kids aged 6 and up, it combines 39 track pieces, 40 puzzle cards, and a roller coaster car to develop critical thinking, spatial reasoning, and planning skills. This award-nominated toy offers clear instructions for quick setup and is trusted by millions of families worldwide.

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Educational Objective(s)	Stem
Language:	English, Japanese
Model Number	1046
Number of Game Players	1
Assembly Required	No
Batteries Required	No
Batteries Included	No
Material Type(s)	Paper, Plastic
Remote Control Included?	No
Colour	Multicolor
Product Dimensions	27.94 x 6.99 x 29.41 cm; 589.67 g
Item model number	1046
Manufacturer recommended age	6 years and up
Manufacturer	ThinkFun
Country of Origin	USA
Item Weight	590 g

ThinkFun Roller Coaster Challenge STEM Toy and Building Game for Boys and Girls Age 6 and Up – TOTY Game of the Year Finalist

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