Design 1:
3D tube maze where the object inside will move via buoyancy by rotating the sphere.
Kids can play it in the bath or pool, toy is design to float so that they can spin and play with it on the water surface.
Toy should be safe and fun to play with for all ages. For infants and young children the toy should be constructed of a more durable material, bigger sphere and simpler tube maze inside. For people of older age the the tube maze inside could be more complicated.
Kids can't swallow it, and the toy should be fairly light, so it should be pretty safe.
Construction could be tough, as the interior of the sphere is a intricate tube maze, so the cost may be around 30$ or more.>