7 years & up. Let's get rolling! Build your own adorable robotic pet hedgehog to play with and perform amusing tricks. The robot features a built-in sound sensor and programmed to react to different sounds. After building your hedgehog, you can play with it by making different sounds and watch it tumble, roll, spin around, bristle its spines, and scurry around. Instruct your hedgehog to perform different actions with various clapping patterns on command. Learn about the inner mechanical workings that enable the robot's movements such as gears, motors, sound sensors, LEDs, and the other components through STEM-based play. Read the 40-page, full-color manual for step-by-step instructions on assembling the robot along with a fun comic about Nuna the Tumbling Hedgehog. Requires 4 AAA batteries (not included). Included: 172 Building Pieces and an Instruction Manual.