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What can we use the coins from crops for after we have finished the quests. They just fill up my gift box. Why can't we use them for other things
if they are in your gift box ... then click on the use button and they will go into your 'bank' when the new farms open they have quests that use coins to advance further in the quest .... thats what I use mine for ...
If you mean the "coins" that are used in the Unwither Ring building all you can do is sell them, I doubt they will ever have any other use.