What is Grandma's Stash?

When you see flying gems going to the side of the screen, it's Grandma! She's adding gems to the stash every time you complete a task, so you can purchase it with real money.

After reaching the initial threshold, you can acquire Grandma's Stash and receive the rewards accumulated until that point. Afterward, the bank will disappear. This is why we recommend that you fill up the Currency Bank with as many rewards as possible before purchasing it!