It's an ad-based game, but...

That being said, there are no forced ads at all, only optional ones, and the ads themselves are quick, like simple puzzles or a game of concentration. It's a win-win. (Though sometimes there are longer ones) For the optional ads where you choose between money, gems, and potions, I recommend picking gems or potions. The hidden quests end once you reach the second stage, which was a bit lacking for someone like me who enjoys these types of games. I'll uninstall it once the daily quests are done, but it's been very fun.