The Piggy Bank provides a one-time Cash reward immediately upon purchase, plus additional rewards for mastering the game's locations ( You get 300 Cash immediately, and up to 2850 as you complete the locations 1-10).

To unlock a Piggy Bank reward, you must achieve 100% completion of a location. This means you must earn all 3 stars on every single mission and challenge within that specific location. Simply finishing the missions or opening all map tiles isn't enough; you need a complete star rating to claim the prize.

Example:
Location 3 has a total of 114 stars. You will only unlock the 300 Cash reward if you collect all 114 stars. If you are missing even one star on a single mission, the reward will remain locked.