This lesson is an extension of Mystery Science Force Olympics Mystery 3. In this extension, students will create a wrecking ball using the Lego WeDo 2.0 kit and program it to knock down a wall. Students will experiment with different variables (like speed, distance and string length) to answer the question: "How can you knock down a wall?" (credit Mystery Science Mystery 3 guiding question). This activity should be done over multiple days (viewing mystery, building the robot and programing and experimenting). Building instructions for the wrecking ball arm are attached as picture steps.