Complete levels and add some extra coins (gold) to your Piggy Bank.
You can purchase the coins stored inside the Piggy Bank at a huge discount when your Piggy Bank is filled with enough coins.
You can open the Piggy Bank only once while the event is up and running! Don't miss out!
The Piggy Bank is a kind of sale - the coins you collect are not free, they are discounted. As soon as you have collected a certain amount of coins on levels, you can buy them on sale.