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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🎢 Engineer your thrill—build, solve, and conquer the coaster challenge!

AWARD WINNING FUN - TOTY finalist recognized for innovative, educational gameplay.
ELEVATE STEM SKILLS - Sharpen spatial reasoning, engineering, and creative problem-solving.
ALL IN ONE BUILD KIT - Tracks, posts, tunnels, coaster car & challenge cards ready to go.
SOLO PLAY MAXIMUM FOCUS - Perfect for independent play that keeps you hooked and thinking.
MASTER 40 LOGIC CHALLENGES - From beginner to expert, conquer every twist and turn.

ThinkFun Roller Coaster Challenge is a single-player STEM logic game featuring 40 progressively difficult puzzles. Designed for ages 6+, it includes a full set of tracks, posts, tunnels, a coaster car, and challenge cards to develop spatial reasoning and problem-solving skills. This award-finalist game offers endless replayability in a compact, travel-friendly box—perfect for curious minds eager to engineer their own roller coaster adventures.

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Product Dimensions	27.94 x 6.99 x 29.41 cm; 589.67 g
Manufacturer recommended age	6 years and up
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
Color	Multicolor
Language	English
ASIN	B071KT3MSN

ThinkFunRoller Coaster Challenge – Single-Player STEM Logic Building Game with 40 Progressive Challenges, Tracks, Post Pieces & Coaster Car – Ages 6+ (1046)

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