Your objective in this awesome RPG strategy game with tower defense elements is to place units to kill invading enemies. Use YOUR MOUSE to place your units on the paved areas of the map. Your units gain experience each time they damage an enemy. When your units have enough experience, they will be highlighted in red and you can level them up. You have the choice to improve a unit's special attack or all round strength. Check the "Protectopedia" for the Extensive documentation. Have fun!