Any tips for farming Mythic Stones?

Without spending money, it seems like there's no other way besides watching ads and doing daily quests. Participating consistently in events is the only other option, I think.

Worried about getting Mythic Stones? Daily quests, watching ads, and participating in various events are the most reliable ways. Consistency is the key to growth, so keep at it, hmm!

If you play the game a lot, collecting hero summon tickets and doing hero summons is the best way to get them without spending money.

If you haven't cleared Hard Mode, clear it to get it. If that's still not enough, get 30 from Hell. If you clear the staff, you might get 30 if you're lucky. Give me Mythic Stones.

Keep at it!