Castlearena is one of the few strategies among io projects. It have to be said that it's top-level strategy. You play a duel against another person, and your task is to destroy all his buildings, at the same time not allowing him to capture yours. Build defensive constructions, create military units, it will help you both to defend the borders and to approach the rival's position.
Also don't forget about buildings that give gold supply to you, for gold you also can buy all remaining buildings. So have a smart approach to the development in this game and then any fight in Castlke arena will add another one to your victories list !
Control: control in th game is entirely based on a mouse.