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

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

Product ID: 47971425

Details

Age range (description)
Little kid Big
Brand
ThinkFun
Item dimensions L x W x H
27.9 x 7 x
Material
Plastic
Size
68.58 cm x cm

🎢39 track pieces for endless coaster creativity

🧠50% logic game + 50% STEM building fun

🧩40 brain-teasing challenges with solutions

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Rp3304128

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Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎢 Elevate playtime with brain-boosting roller coaster thrills!

BUILT TO LAST ENGAGE - High-quality plastic components ensure sturdy builds that keep the roller coaster running smoothly, challenge after challenge.
SOLO PLAY INFINITE FUN - Perfect for independent play, empowering kids 6+ to develop STEM skills while having addictive fun.
STEM LEARNING MEETS PLAY - Seamlessly blends creative skill-building with hands-on STEM education, making learning irresistible.
CHALLENGE YOUR MIND DAILY - Tackle 40 unique puzzles that progressively sharpen critical thinking, problem-solving, and planning skills.
MASTER THE ART OF ENGINEERING - Build intricate roller coasters with 39 durable track and 36 post pieces designed for stability and endless configurations.

ThinkFun Roller Coaster Challenge is a STEM-focused building and logic game featuring 39 track pieces, 36 posts, and 40 challenges designed for kids aged 6 and up. It combines hands-on engineering with critical thinking puzzles, fostering creativity and problem-solving in a durable, solo-play format.

Specifications

ASIN	B071KT3MSN
Age Range Description	Little kid, Big kid
Best Sellers Rank	48,609 in Toys & Games ( See Top 100 in Toys & Games ) 997 in Board Games (Toys & Games)
Brand Name	ThinkFun
Country Of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (2,608)
Educational Objective	Creative Skill, Critical Thinking, Problem Solving, To Build
Global Trade Identification Number	00019275010461
Included Components	39x Track Pieces, 36x Post Pieces, 2x Tunnels, 40x Challenges with Solutions, Game Grid, Instructions
Item Dimensions	27.9 x 7 x 29.4 centimetres
Item Weight	1.3 Pounds
Manufacturer	Ravensburger
Manufacturer Part Number	1046
Manufacturer Warranty Description	2 year manufacturer
Material Type	Plastic
Maximum Age Recommendation	120
Model Number	1046
Set Name	Roller Coaster Challenge
Size	68.58 cm x 6.99 cm x 29.91 cm
Theme	Educational, Humor
Unit Count	1.0 count

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