A lone archer is protecting a castle. Hordes of enemies come continuously hoping to take down the castle. The castle won't stand forever but that does not mean that our hero archer will just give up. This archer will shoot arrows at the incoming attacks for as long as it takes to hold out the enemy.
Take your archer; make him aim and then shoot at the incoming siege that seems to never give up. Upgrade and repair the tower as required and if possible.
Mouse movement: Aim
Mouse click: Fire Arrows