Learn about gravity with the PlanToys Land The Planet game. Players control a marble along the steel rods by closing and widening the gap between them and steering over planets to let the marble fall into the correct hole. Children can learn about planning, cause and effect, and problem-solving skills. Players can control the speed of rolling marbles by adjusting the width of the rails. The farther the hole is, the more challenging it is. You can also use the board as a matching and puzzle game by placing different planet pieces into the correct holes.