Cuboro 16 Marble Run Starter SetSTANDARD 16 the small Starter Set. Create exciting marble runs with all central cubes of the CUBORO system. Extra Sets expand the Starter Sets and offer additional fun. CUBORO challenges children and adults according to their abilities while awakening the joy of experimentation and supporting logical thinking. The marble run system trains fine motor skills, strengthens spatial imagination and stimulates creativity. You can play alone or in a group.