You take your spaceship out for a spin when suddenly you realize that it is low on fuel. Lucky for you, the spaceship has a battery that can get charged by collecting space numbers - whatever they are! And more luck to you - you are just passing a number shower! Your spaceship needs to catch those numbers to charge its battery. But it can't catch 'any' number! It can only catch the numbers that will keep the battery's charge within the given range. If the charge goes above or below the range, the battery will explode!
Your score will keep increasing as long as you keep charging and every number caught will give you 50 points. As your score goes up, bonus stars that give you double or triple points, aliens with special powers, and even expressions will start making an appearance and you will also graduate from easy to harder levels - the numbers will start coming down faster. It takes five minutes for your spaceship to reach the mother ship. How much can you score in that time?
Sharpen your math skills, add fast, and keep charging!