Creatto is a simple yet versatile building system that consists of just two primary components that can be woven together into countless 3D creations. The flexible yet durable plastic tiles interlock quickly and easily for all skill levels; no additional materials or hardware required! With 77 Creatto pieces and a string of 40 LED lights, you can build a big heart, flower, butterfly, and picture frame. Battery-powered lights require 2 AA batteries.