To those coming in for Action Quests. Don't do them.

Action Quests give a lot of rewards. However, you might not receive the rewards due to errors, and even if there are no errors, the gameplay time is very long. *My game installation mission had an error, and after contacting customer service, all my remaining action quests disappeared. Unlocking 100 themes... etc. sounds easy. But it's not. The game itself is easy, but an ad pops up after every match. And clearing a game isn't the same as unlocking a theme. There's a separate 'Theme' icon in the game. You use the in-game currency (rewards) you get from clearing games to collect flowers, and then use those flowers to unlock themes. All in all, it will take a tremendous amount of time. I recommend just not doing them.