Your mission is to use weapons that can change their value to destroy the enemy numbers falling from the sky. Your weapons are arranged in the center of the area below the screen, on the left is a button that allows you to change the value of the weapon. The enemy numbers will continuously fall from the sky, if it falls completely below you will fail, these numbers carry numerical values that are divided into two types: even and odd numbers. Your weapon can alternate between these two types of numbers. Only when the weapon has an even number value can it destroy an even number enemy, the same goes for odd numbers. The value of the weapon and the enemy number do not need to be equal, they just need to be the same number. To use a weapon to destroy an enemy, you just need to touch the number and the weapon will quickly fire at that number. Be careful in choosing between the numbers if you don't want to suffer bitter defeat.