Last Defence is a game in which your main objective is to defend the factory that is being attacked by waves of robots. You will have a lot of missiles that you must use very effectively to destroy the robots because they cause any harm or damage. The launched missiles will also trigger chain reaction that cause maximum damage to the robots. The robots will be of different colors and the missiles launched at them must be of the matching colors. You must heed the tutorial in the game to know how to launch the missiles correctly. All the best!