Rats want the cheese, and you are the one standing guard with a shotgun. Parmesan Partisan is a compact arcade defense game where wave after wave of rodents heads for your cheesy homeland and has to be stopped first.
Aim with the mouse or touchpad and click to fire. That is the entire control setup, so the skill lies in where and when you pull the trigger.
Take out every rat before it reaches the cheese. The invasions keep coming, so speed and planning both matter as the stages go on.
Power-ups and skills boost your firepower as you progress, and the best single habit is aiming at tight clusters so one blast hits several rats. For a different arcade reflex workout, there is Arkanoid Flash.