Salvo: ships at war

With your enemy ship facing you, you have the chance to shoot the enemy ship down. The enemy ship also has the chance to shoot you down equally.

The button to fire at your enemy ship are two buttons . They are always flushing at two second interval.
two numbers are added or subtracted on top of the buttons. You have to click which one has the correct solution on top of it. If you click it, and it is right you fire at your enemy, else your enemy fires you.
Click one of the buttons for each question, if you don't, the enemy fires you.

You can call in for air support if you have fighter jets available.

It is a really exciting game which takes inspiration from salvo combat technique