User blog comment:Pgrobban/The rise and fall of Cookie Run/@comment-24956068-20151002102429/@comment-25889587-20151002180301

Ah yes, those missions requires people to use S-grade treasures more than usual.

The IAP exclusive content is not really a necessity though. It's just a way to boost yourself up in-game if you're a beginner. I mean, Coin Scale is a much better pet to equip than White Gold Drop, and there's always an alternative to those two A-grade treasure, such as Prosperity Bracelet of Earth, obviously.