It's fun to play: it'll keep you trying for hours. The size of the ball is perfect for adults to hold comfortably. Colored buttons are easy to press. The material used to make the ball is very durable and durable. Workaround: With an empty circle, you can use the empty space to push the colored balls to match the color of the balls with the rings outside the circle. There's a sponge center in the balls, and when you press them, let the colored balls slide from one space to another. Mix again: Mix it the same way you solved it. Randomly start moving the pieces until they're all mixed together. You can strategically move them away from their "home" to make it harder. Suitable for all ages: it will keep you trying for hours. Important activities are teaching children to grapple with complex problems and strengthening children's memory.