Flak Warrior is simple arcade shooter. The player takes care of a flak cannon and kills every plane which crosses his sight. The flak is controlled by the mouse and can be rotated through 360°. It is not a wise idea to shoot constantly because then the flak overheats and needs a cool-down time. During that time planes can pass unopposed - and after a few planes the player loses the game.
There are five missions including an unlockable one.