Darkness Springs Defense - a great mix of tower defense and strategy game, also known as DSDefense, where you have to control a small village, starting at the town center, and need to protect this village from hordes of monsters arriving at the village. The main objective in the game is to build buildings to defend the town center. You can upgrade the more advanced tower types two times by selecting them, and clicking on Upgrade button. The towers will shoot then more powerful bullets and more of them at the same time. This works for the fire, ice and lighting magic towers.