Select an empty tile construct some buildings on them. Then use the structures to produce units with which to destroy enemy base. Once produced units will attempt to reach the enemy base and if they survive they will damage the closest enemy structure. If there are no complete structures on the enemy base when your ground unit reaches it you win the level (and vice versa). Most aircraft and missiles will damage all or random enemy structures but they cannot trigger a victory. Most units (except bombers and missiles) can engage the enemy as they make their way to the base thereby defending yours. There are also special structures such as anti-tank rocket launcher sites and SAM sites that can protect your base. Money is automatically deposeted into your account every period of time. To increase that ammount special financial structures are used. In Campaign your job is to take the enemy capital city. In order to do that you must capture various regions on the way there. Many of them contain valuable resources whick are needed for non basic units and structures. The more regions you posess the more initial money you get when level starts.