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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ローラー・コースター・チャレンジ

Product ID: 735889147

Details

Age Range (Description)
Kid
Brand
ThinkFun
Material
Acrylonitrile
Number of Players
1
Theme
Educational

🎢40 multi-level challenges

🧠Boosts physical & logical thinking

👨‍👩‍👧‍👦Solo or group play

€ 112.84

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Description

🎢 Engineer your fun — build, think, and thrill!

FLEXIBLE PLAY FOR ALL - Perfect for solo focus sessions or engaging family game nights.
COMPLETE ENGINEERING KIT - Includes rails, pillars, tunnels, and coaster for immersive course building.
HANDS ON PHYSICAL THINKING - Design roller coaster tracks that sharpen spatial and logical reasoning.
40 BRAIN TEASING CHALLENGES - Progress through 4 difficulty levels that grow with your skills.
AWARD WINNING EDUCATIONAL FUN - Trusted by thousands with a 4.5-star rating to boost STEM skills.

ThinkFun's Roller Coaster Challenge is an educational board game designed for ages 6 and up that develops physical and logical thinking through hands-on roller coaster track building. Featuring 40 problem cards across 4 difficulty levels, it supports solo or group play and includes all components needed to create dynamic coaster courses. Highly rated and perfect for STEM skill development, it’s a must-have for families and young learners eager to combine fun with brain-boosting challenges.

Specifications

ASIN	B071KT3MSN
Age Range Description	Kid
Amazon Bestseller	#11,874 in Toys & Games ( See Top 100 in Toys & Games ) #594 in Board Games (Toys & Games)
Brand Name	ThinkFun
Color	Roller Coaster Challenge 1046 Ages 6+
Container Type	Box
Customer Package Type	Standard Packaging
Customer Reviews	4.5 4.5 out of 5 stars (9,586)
Educational Objective	Physical Thinking
Global Trade Identification Number	00019275010461
Grenre	Educational, Family, party
Included Components	Set Includes: 40 problem cards, 1 game board, 36 pillars, 39 rails, 2 tunnels, 1 coaster
Is Assembly Required	No
Item Dimensions	27.9 x 7 x 29.4 cm
Item Type Name	Board Game
Item Weight	590 g
Language	English
Manufacturer	Ravensburger（ラベンスバーガー）
Manufacturer Maximum Age (MONTHS)	1296
Manufacturer Minimum Age (MONTHS)	72.0
Manufacturer Part Number	1046
Material Type	Acrylonitrile Butadiene Styrene, Polypropylene (PP)
Model Number	1046
Model Year	2016
Number of Items	1
Number of Players	1
Package Quantity	1
Product Style	Roller Coaster Challenge
Theme	Educational
Unit Count	1.0 Count

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