Apart from the regular rewards, you get bonus coins and energy for each level you beat. They are kept in a piggy bank, which you can check by tapping the button on the right side of the screen.

As soon as you collect the maximum amount of coins and energy, you'll have the chance to buy them at a good price. The bonus coins and energy don't influence the regular rewards for beating a level: you get the same rewards with or without the piggy bank.

You can buy the coin piggy bank and the energy piggy bank separately, or together: in this case the price will be even more attractive. The offer is valid for limited time: don't miss out!