The Sandbox is a game mixes the mechanics of a elemental discovery game and sandbox games. I must tell that its kinda buggy. I bricked iPad about 3-4 times. it shows that iPads aren't ready for insane environmental calculations. but its fun. its game mechanics and achievement system is too strict. manu usabilities, and interface is not perfect. so sometimes you get bored of going back and forward to story and freeplay modes. here you go, try it free!