The mythical dragon world comes to life with the colorful Hidden World Playset! Place the Dragons figure included inside the lair. Push the button on top to activate the UV light to reveal your dragon's hidden bioluminescent patterns. Collect all the magical playsets each with a different dragon figure! COLLECT AND PLAY: All Mystery Dragons figures (sold separately) fit inside the DreamWorks Dragons Hidden World Playsets. Place any figure inside and activate the UV light to reveal any hidden bioluminescent scales! Requires 3 x LR44 batteries (Included).