Simple Machines HEXBUG : STEM Challenge Cards is a great *low prep* resource to review Simple Machines with your students. Works great as a center activity, lesson extention, or part of a Makerapace. Students LOVE HEXBUGS!In this engaging lesson, students follow 6 HEXBUG Challenge Cards to problem-solve and construct simple machines (such as inclined planes and pulleys) to help their HEXBUG move large tape "boulders". Students create using legos, tape, rulers, string, HEXBUG robots, and, of cour