Alien flying spacecraft have appeared in the black night sky and it's time for you to uncover your laser ground cannon to defend the planet from invasion. But the gun will not shoot just like that, it needs a team and not a simple one, but a digital one. A number will appear on the body of the gun and this is not the number of charges, but the amount that you must find on the flying saucers by solving the mathematical examples written on them. Once you find the right target, click on it and the cannon will automatically move and hit with a beam. You don't need to hover, just select the desired example in the Alien Addition. Go through the levels, they need to destroy a certain number of targets ha allotted time.