The Piggy Bank is a new feature that will offer you a gold bar package, which will be generated as you earn crowns in the different game modes.
Bear in mind that the more crowns you obtain, the bigger the prize. You will be able too see the progression of your Piggy Bank by selecting the icon that appears on the game’s main screen. You will also be able to claim the prize from there.
To get the Piggy Bank's prize, you will have to pay a set cost in real money. You will be able to buy it whenever you wish to. However, because the prize will be getting bigger, the more crowns you obtain, the more convenient it will be. To get more information on how to use the Piggy Bank, we suggest you visit the following article: How can I get the Piggy Bank's resources?