So there's quite a few missions i have had issues completing over the months from Mission 15 to 29, I've had a lot of difficulty finding guides for specific levels is there anyone than can give guidance. I remember at one point i was able to find help on the wiki with specific events and missions but it seems most of them there aren't any comments.
Starting at Mission 15-1 to 15-4, the plan is to get gems from all completing all of them.