Your mission is to occupy as many fields as possible by getting the required amount of points.
At the beginning of the game you have some amount of points and instructions how many points you need to grab.
You choose the first field and solve mathematical exercise. If you succeed, the field is yours together with points on that field. If you loose, the field remains free and amount of points will be removed.
Then you choose next field and solve new mathematical exercise. You can choose only neighbouring fields to on of already occupied fields by you.
You collect fields and points till you grab required amount of points or you occupy whole city.