In the Daily Missions, all you need to do is simply complete the missions you get every day.

 

 

For completing the Mega mission, you can get even greater rewards, including special tokens you can use to re-roll the missions you don’t really like.

 

 

Moreover, on the 7th day, you can use the keys you receive for completing all 3 missions to play the mini-game. Just open the Daily Challenge menu and navigate to the "Mini-game" tab on Sunday in order to play it and enjoy your adorable prize!

 

 

* Please note that the missions may differ from those on the screenshot and vary from player to player.