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.

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

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

Product ID: 76903367

Details

Age Range (Description)
72 months to
Brand
ThinkFun
Item dimensions L x W x H
27.9 x 7 x
Material
Paper Plastic
Size
11 x 2.75 x

🎢50+ logic & building challenges

🧠Boosts critical STEM skills

🧩40 puzzle cards with solutions

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Description

🎢 Build, solve, and thrill your brain with every twist!

AWARD WINNING BRAIN GAME - TOTY Game of the Year finalist recognized for blending fun with education seamlessly.
INSTANT FUN ZERO HASSLE - No assembly or batteries needed—start solving puzzles right out of the box.
MASTER STEM THROUGH PLAY - Engage young minds with 60 escalating challenges that sharpen engineering, reasoning, and planning skills.
ALL IN ONE ROLLER COASTER KIT - Includes 36 posts, 39 tracks, and a coaster car for hands-on creative building.
TRUSTED BY MILLIONS WORLDWIDE - Join over 50 million families who rely on ThinkFun for brain-boosting entertainment.

ThinkFun's Roller Coaster Challenge is a STEM-focused logic and building game designed for kids 6 and up. Featuring 60 progressively challenging puzzles, it combines hands-on roller coaster construction with critical thinking development. This award-nominated set includes a game board, 36 posts, 39 tracks, a coaster car, and 40 puzzle cards with solutions, all ready to play without assembly or batteries. Perfect for nurturing engineering and reasoning skills through immersive, screen-free fun.

Specifications

ASIN	B071KT3MSN
Age Range (Description)	72 months to 1188 months
Age Range Description	72 months to 1188 months
Best Sellers Rank	#357,779 in Toys & Games ( See Top 100 in Toys & Games ) #1,081 in Toys (Amazon Launchpad) #9,486 in Home #13,831 in Board Games
Brand	ThinkFun
Customer Reviews	4.6 out of 5 stars 2,601 Reviews
Educational Objective	Playing Through The Challenges Builds Engineering, Reasoning And Planning Skills And Provides A Great Stealth Learning Experience For Young Players Educational Objective Playing Through The Challenges Builds Engineering, Reasoning And Planning Skills And Provides A Great Stealth Learning Experience For Young Players See more
Global Trade Identification Number	00019275010461
Included Components	One game board, 36 posts, 39 tracks, one roller coaster car, and forty mind challenging cards with solutions
Item Dimensions	27.9 x 7 x 29.4 Centimeters
Item Type Name	Roller Coaster Challenge STEM Toy for Boys and Girls and Building Game - TOTY Game of the Year Finalist
Item Weight	590 g
Item dimensions L x W x H	27.9 x 7 x 29.4 Centimeters
Manufacturer	ThinkFun
Manufacturer Part Number	1046
Manufacturer Warranty Description	No Warranty
Material	Paper, Plastic
Maximum Recommended age	1188
Minimum Recommended age	72.0
Model Number	1046
Size	11 x 2.75 x 11.58 inches
Theme	Educational
Unit Count	1 Count

Reviews

J**B

for a 8 to 12 year old

Good engaging game. My 12 year completed all the tasks over 2 days.

27.12.2018

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