Hordes of alien invaders are threatening to invade planet Earth, descending from the skies in countless numbers. You must destroy them with your laser cannon before they land. In the meantime, you must avoid getting hit by alien laser bombs.
The closer those battle crazed monsters get to Earth, the faster they move, unleashing more of their deadly laser bombs! Even when you think they've all been destroyed, another set of invaders appears. The battle is on again!
Concentrate--you must be fast and accurate to save your world!