Really wanted to love this product and couldn't figure out why it wasn't sold at more stores. Well it's because the balls don't roll down the tubes when wet, so it's basically useless. The ball roll part is also very unstable and falls off super easily. My husband put screws through it to hold together, which worked. My son just pulls the catapults off, but maybe that's because he's two. In any case, my son loves any kind of ball. I thought it would be super fun for him, but he more enjoys just splashing in the water since the balls always get stuck.