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 c