Time, Hidden Quests, and Attendance Rewards

Sometimes time-limited quests appear, and hidden quests are easy to complete... The game difficulty is around 'Easy'? Usually, it takes about 10-15 minutes once a day to finish. I kept playing because of the 60-day attendance reward, and now I'm still playing. Since it doesn't take much time or require difficult controls, I think it's not bad. Recommended for those who need a multiplayer game.