Snap Circuits® 3D Illumination uses building blocks with snaps to build the different electrical and electronic circuits in the projects. Each block has a function: there are switch blocks, light blocks, battery blocks, different length wire blocks, etc. These blocks are different colors and have different numbers on them so that you can easily identify them. Build over 150 projects or combine with other sets to build even more unique structures.• Exciting Light Effects• 3-Color Light Tunnel, Mirrors & Reflecting Circuits• Magnet & Magnetic Switch• Projector with 6 Images• Includes vertical stabilizer, base grid stabilizer & base grid support• 3 AA batteries required but not included