The objective of the game is to deliver as many stones to the factory so you need to be careful when delivering the stones. Don’t let any of them fall down or else the mission is a failure. Don’t worry about getting into trouble since there are no obstacles except for several mountains you need to cross.
You need to repeat the game if the stones are not enough so you really need to take care when delivering those stones. There is a time limit so you need to hurry in delivering those stones to the factory. The game has 8 different levels that you need to conquer.