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. Download "House of Lights" super circuit. Download "Big Structure" super circuit here! Detailed Specifications: See a list of projects you can download and view with Acrobat Reader in 3D. You will be able to turn and rotate the illustrations to get better views of the final build.