ThinkFun Roller Coaster Challenge STEM Building Game 40 Challenges Complete

ThinkFun's Roller Coaster Challenge — the single-player STEM puzzle game where you design and build your own working roller coasters. The box includes a 5x5 grid base board, all the colorful plastic track sections and support pieces (orange, yellow, red, and green), and a deck of 40 challenge cards ranging from beginner to expert. Here's how it works: pick a challenge card, place the starter pieces as shown, and then figure out how to connect the track using the remaining pieces so the coaster completes the loop. It sounds simple until it really isn't — and then it clicks and you want to do the next one immediately.  ThinkFun is one of the best in the STEM puzzle game category. This game is a perennial favorite for kids ages 6+ and adults who like a good spatial reasoning challenge. Appears complete with all or most pieces; grid board and challenge booklet included.