Cuboro, first introduced in Switzerland in 1986, is an ingenious marble run designed and crafted meticulously from European beechwood. The 2" cubes have a variety of channels and tunnels that allow a seemingly infinite number of combinations and marble run creations, simply by placing the blocks together. This unique concept in marble runs gets the creative problem-solving juices flowing, helps develop spatial awareness and absorbs the attention (even among those for whom staying focused is an issue) for long periods at a time. The variety of supplementary sets gives the "Cuboro-holic" plenty of ways to expand their system and capabilities.