Ideal for developing cognitive skills!  Great for both children and adults, this innovative puzzle has removable blocks which allow the user to progressively increase the skill required to complete the task. Start with one shape and any four blank blocks and build up to five distinct shapes. When the task is completed, music plays. If a reward toy or device is connected to the blocks, it will automatically turn on but music will not play. You can easily shift or rotate the blocks to teach spatial relations, form constancy and mental imagery.