Mission Cards are a new feature that were added in Version 1.3. These cards can give you specific missions to accomplish and give various rewards for completing them. Each Mission Card has a number of missions to complete and each mission gives a certain amount of stars for completion. These stars act as reward markers and give you items when you hit certain milestones.

You can only have one Mission Card on the go at any one time. When you achieve the missions, you will be notified after completion of the stage, and receive any items if you now qualify for them. You can't spread the mission requirements over 1 stage, so if it's Make 3 Matches of 4, it has to be done in one stage.