Description Build strong defenses and lead your troops to victory against Kron Corporation’s invasion in this action-packed tower defense game Controls Use your mouse to create defense units and position them on the map. *** Hotkeys *** B : Barracks F : Factory C : Air Command X : Mine T : Trooper G : Grenadier K : Marksman E : Elite Trooper N : Machine Gun Turret A : Artillery Cannon R : Grenade Launcher L : Laser Cannon M : Missile Launcher S : Plasma Cannon D : Disruptor I : Ion Cannon 1-4 : Air Strikes