This is a numerical form of Space Invaders. The aim of this game is to increase or decrease the number on the left side to match the one of the numbers coming from the right side. When you have a match, press the fire button to eliminate that number. Try to keep the numbers from reaching the left side. Once the numbers reach the left side (10 numbers) , you lose a life. A new game is started with three lives. Once you lose those, it is GAME OVER.