Most Gems earning quest.

try action quests

you'll make a lots of coins

land of jail is good time quest atm. but it's only for limited time so !

If you're talking about time quests, new accounts like yours will have very different ones offered than most. (Non broken) Gem rate just depends on how much you've played the game before. Just try to continue jumping between games if all you care about is gems. Can't comment on which games will or will not have tracking problems for you, seems like it's client side

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