Board Thread:General Discussion/@comment-24956068-20151109173530/@comment-25889587-20151201044156

Well, you can only hope to get the Choco Chip Cookie from the Good Treasure Chest with only 5,000. It requires luck though.

My philosophy is to use as least crystals as possible because obviously Crystals are more valuable than coins in this matter. The priority of crystal spending are already mentioned in the Crystal article, although sometimes I used 5 crystals to get the cookie back up when I score pretty high.