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 Boys

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Description

🎢 Build, solve, and thrill your way to STEM mastery!

AWARD WINNING DESIGN - TOTY Game of the Year Finalist—play the critically acclaimed classic
BRAIN BOOSTING STEM FUN - Master engineering, reasoning & planning with every build
ALL IN ONE CHALLENGE KIT - Includes game board, 36 posts, 39 tracks & roller coaster car for endless creativity
INSTANT PLAY ZERO HASSLE - Clear instructions let you dive into fun and learning within minutes
PERFECT GIFT FOR FUTURE INNOVATORS - Ideal for kids 6+ to develop critical thinking through hands-on play

ThinkFun's Roller Coaster Challenge combines 60 logic puzzles with a hands-on roller coaster building set, designed to develop critical STEM skills in kids aged 6 and up. Featuring over 75 durable pieces and clear instructions, this TOTY finalist offers a seamless blend of fun and education that sharpens engineering, reasoning, and planning abilities through progressively challenging gameplay.

Specifications

ASIN	B071KT3MSN
Age Range Description	72 months to 1188 months
Best Sellers Rank	#16,819 in Toys & Games ( See Top 100 in Toys & Games ) #420 in Board Games (Toys & Games)
Brand Name	ThinkFun
Color	Multicolor
Container Type	Box
Customer Package Type	Standard Packaging
Customer Reviews	4.6 4.6 out of 5 stars (2,707)
Educational Objective	Playing Through The Challenges Builds Engineering, Reasoning And Planning Skills And Provides A Great Stealth Learning Experience For Young Players
Global Trade Identification Number	00019275010461
Grenre	Educational
Included Components	One game board, 36 posts, 39 tracks, one roller coaster car, and forty mind challenging cards with solutions
Is Assembly Required	No
Item Dimensions	11 x 2.75 x 11.58 inches
Item Type Name	Roller Coaster Challenge STEM Toy for Boys and Girls and Building Game – TOTY Game of the Year Finalist
Item Weight	1.3 Pounds
Language	English
Manufacturer	ThinkFun
Manufacturer Maximum Age (MONTHS)	1188
Manufacturer Minimum Age (MONTHS)	72
Manufacturer Part Number	1046
Manufacturer Warranty Description	No Warranty
Material Type	Plastic
Model Name	Original
Model Number	1046
Model Year	2016
Number of Items	1
Number of Players	1
Operation Mode	manual
Package Quantity	1
Power Source	manual
Product Style	Standard Packaging
Set Name	Roller Coaster Challenge
Size	11 x 2.75 x 11.58 inches
Theme	Educational
Unit Count	1.0 Count

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