Nesting Puzzle - Unit PlusUsing three types of geometric hollow blocks (cube, cylinder, and triangle), children are invited to explore spatial relation, early mathematic skills, and hand eye coordination with the PlanToys Nesting Puzzle. Have fun matching, stacking, and nesting the various shapes, and stimulate your problem solving skills by completing the puzzle successfully! Compatible with other block sets in the Unit Plus series. Children can sort the nesting puzzle pieces