Aliens are trying to invade the planet. To keep them out, answer the math questions they present and shoot them the answer. If you get it wrong, they will keep coming. If you get it right, they will leave. So get them right!
Aliens are trying to invade the planet. To keep them out, answer the math questions they present and shoot them the answer. If you get it wrong, they will keep coming. If you get it right, they will leave. So get them right!