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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RollerCoaster Challenge

Product ID: 47971425

Details

Age range (description)
Little kid Big
Brand
ThinkFun
Material
Plastic
Number of players
1+
Theme
Educational

🎢39 track pieces for endless coaster creativity

🧠50% logic game + 50% roller coaster building = brain workout

🧩40 logic challenges to boost critical thinking

709068Fr

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Description

🎢 Think. Build. Conquer the coaster of logic!

BUILD BRAINSTORM - Combine hands-on roller coaster construction with stimulating logic puzzles for double the fun and learning.
COMPLETE CREATIVE KIT - Includes 39 track pieces, 36 posts, 2 tunnels, and 40 challenges with solutions—everything needed to engineer excitement.
SOLO PLAY INFINITE FUN - Perfect for independent play, letting kids dive deep into problem-solving at their own pace.
AWARD WINNING EDUCATIONAL FUN - From the world leader in addictively fun games, this set guarantees smiles while developing essential STEM skills.
DESIGNED FOR YOUNG INNOVATORS - Tailored for ages 6+, this game sharpens critical thinking, creativity, and spatial skills.

The ThinkFun Roller Coaster Challenge is a hands-on educational game blending roller coaster building with 40 logic puzzles. Designed for kids 6 and up, it includes 39 track pieces, 36 posts, tunnels, and a game grid, promoting critical thinking, creativity, and independent play. Portable and highly rated, it’s a perfect STEM toy that makes learning irresistibly fun.

Specifications

ASIN	B071KT3MSN
Age Range Description	Little kid, Big kid
Best Sellers Rank	18,364 in Toys & Games ( See Top 100 in Toys & Games ) 442 in Board Games (Toys & Games)
Brand Name	ThinkFun
Colour	Multicolor
Container Type	Box
Country Of Origin	China
Customer Package Type	Standard Packaging
Customer Reviews	4.5 4.5 out of 5 stars (2,622)
Educational Objective	Creative Skill, Critical Thinking, Problem Solving, To Build
Global Trade Identification Number	00019275010461
Grenre	Educational, Family
Included Components	39x Track Pieces, 36x Post Pieces, 2x Tunnels, 40x Challenges with Solutions, Game Grid, Instructions
Is Assembly Required	No
Item Dimensions	27.9 x 7 x 29.4 centimetres
Item Dimensions L x W	25.6L x 25.6W centimetres
Item Type Name	game
Item Weight	1.3 Pounds
Language	English
Manufacturer	Ravensburger
Manufacturer Part Number	1046
Manufacturer Warranty Description	2 year manufacturer
Manufacturer recommended age	0 - 10 years
Material Type	Plastic
Model Name	Roller Coaster Challenge
Model Number	1046
Model Year	2016
Number of Items	1
Number of Packs	1
Number of Players	1+
Operation Mode	manual
Other Special Features of the Product	Portable
Package Quantity	1
Power Source	Manual
Product Style	Classic
Set Name	Roller Coaster Challenge
Size	68.58 cm x 6.99 cm x 29.91 cm
Subject Character	ThinkFun
Theme	Educational, Humor
Unit Count	1.0 count

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