For the past few years we’ve been featuring a variety of brainteasers from ThinkFun, most recently in December when we provided a Roller Coaster Challenge overview. These puzzle-style games offer hours of entertainment with plenty of replay value and each one offers a new theme. Whether it’s boats, lasers, gravity, coding or something else, they generally incorporate STEM principles which is why we included this latest in our STEM entertainment gift guide. Day 95 of our 150+ Days of Giveaways is Roller Coaster Challenge. Don’t worry, you won’t get dizzy if you win this one!