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

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

Product ID: 259719484

Details

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

🎢40 progressive coaster challenges

🧠Boosts STEM & 3D thinking

🧩77+ precision build pieces

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Description

🎡 Engineer your thrill — build, solve, and conquer every twist!

AWARD WINNING DESIGN - TOTY Game of the Year finalist recognized for educational impact and replay value.
COMPACT TRAVEL READY - Mess-free, neatly stored pieces in a sleek box—ideal for on-the-go STEM adventures.
COMPLETE STEM BUILD KIT - Includes tracks, posts, tunnels, coaster car, and challenge cards for immersive hands-on learning.
SINGLE PLAYER FOCUSED FUN - Perfect for independent play that keeps curious minds engaged and entertained.
MASTER 40 LOGIC CHALLENGES - From beginner to expert, each puzzle sharpens spatial reasoning and engineering skills.

ThinkFun Roller Coaster Challenge is a single-player STEM logic game featuring 40 progressively challenging puzzles. Designed for ages 6+, it includes over 70 build pieces such as tracks, posts, tunnels, and a coaster car, fostering spatial reasoning, engineering skills, and creative problem-solving. This award-finalist game offers endless replayability in a compact, travel-friendly kit that inspires independent, hands-on learning.

Specifications

ASIN	B071KT3MSN
Age Range Description	Little kid, Big kid
Best Sellers Rank	#12,988 in Toys ( See Top 100 in Toys ) #408 in Board Games
Brand Name	ThinkFun
Color	Multicolor
Container Type	Box
Country of Publication	China
Customer Package Type	Standard Packaging
Customer Reviews	4.6 4.6 out of 5 stars (2,604)
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 centimeters
Item Dimensions L x W	25.6L x 25.6W centimeters
Item Type Name	game
Item Weight	1.3 Pounds
Language	English
Manufacturer	Ravensburger
Manufacturer Maximum Age (MONTHS)	216
Manufacturer Minimum Age (MONTHS)	72.0
Manufacturer Part Number	1046
Material Type	Plastic
Model Number	1046
Model Year	2016
Number of Items	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 Count

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