Missions are part of Campaigns and can be played for free. A mission features a set of objectives that must or can be completed sometimes within a certain time limit. Upon completion of an objective, the player will be rewarded with score that contributes to the player's rank. There are many different ranks each with 5 stars that have to be unlocked with increasing difficulty. Upon the completion of a star, the player will be rewarded with a set amount of gold. If all objectives of a mission are completed, the player will receive a medal that gives a certain amount of bonus score. Missions also have different enemies with different units and a different map per mission. Missions may be replayed for a better score, gold or medals.