An Extra Goal (formerly known as a Super Mission prior to v10.1.0) is the ninth, final goal assigned to every standard sharks in Hungry Shark Evolution. There is Only one Extra Goal for every shark. The Extra Goal is usually considered to be the most difficult and the hardest goal to complete, and therefore rewards a generous sum of 
coins: more coins than any of the other goals.
Completion[]
Extra Goals are unique in the sense that they require a minimum score of points to be earned in order to complete them. Extra Goals can't be attempted until the eight standard goals are completed.
The stronger the shark is, the more difficult the Extra Goal and the greater the reward.