This Zoobles Light Up - Glowworm has built in leds. With a unique light up pattern in every Zooble, no 2 light up Zoobles are alike. Place Zooble on or in its happitat and watch the amazing illumination!Welcome to the world of Zoobles! Venture into magical, mysterious world of Zooble Isle, where you'll find over 100 different critters! Curled up in little balls and hidden high upon the treetops and in the depths of the seas, Zoobles spring to life when you place them on their "happitat", transforming into cute, colourful, quirky characters to play with! When you press their heads, their eyes even blink! And you can decorate them with stickers to make them your own. You'll have tonnes of rolling fun and pop-open surprises when Zoobles spring to life! There are so many magical ways to play!