In this real-time strategy game, you are tasked with building towers to defend your citizens. Land Towers will defeat walking monsters, Air Towers defeat flying beasts, and Plant Towers can take on both, but are weaker than the other two. As you progress, you'll be able to upgrade or build new towers with the gold you've earned and add on special abilities through skill points you've accumulated. Choose your defense carefully to keep your citizens protected! If even one monster gets past your guard, it could spell certain doom for your entire city.