Hidden Quests Finally All Completed

I've played this game for the third time after switching phones and creating a side account, and I finally managed to complete all the hidden quests smoothly. The trick is to first use magic stones to increase the limit of the Fountain of Life (Holy Water). With more Holy Water, you can upgrade various special effects. Then, you can double the offline rewards you get every two hours by watching an ad (this is the most cost-effective ad; others have very low CP). Also, remember to train your wizard to increase combat power so you can smoothly unlock the second map.