Easy Peasy

Early on, if you play the daily quests, you get hidden quests too, so you can earn quite a bit of gems. It's a game you literally just leave alone. At first, I didn't know what to do, but it's a game where you occasionally check in and tap to level up items to clear stages. I just tap away at it in between doing other tasks that don't require my phone. If you're aiming for the hidden quests in the later stages, watch ads to speed up your progress. A slightly long ad will play.