Sand Castle, also known as Sandcastle at Friv, is a medieval strategy game online. It is a combination of a shooting and a tower defense Friv games. Defend your city from the invading ships. Use different types of cannons and ammo to destroy the ships and sink them. Click your left mouse button to shoot, hold the mouse button down longer for more power. Move the mouse cursor while holding the button to set the angle of your shot, release to shoot. Press space bar after shooting to cancel it. Fight 7 interesting battles and survive in Sand Castle game online at Friv Games!