Chosse "CAare" from the main menu, then touch the "Secret" taband select "Codes" . Enter any of the following codes:

When you are in your shop(s) and your helping customers if a princess comes in it indicates that your shop is going to get bigger. Every time you see her, your shop will most likely to get bigger unless it has reached its peak of four upgrades.

When you get all your stores to the fourth level, the prince will do something that includes the Princess.

When a customer comes in your shop that looks famous, ( ex. a cell phone man or a man with a directors hat on) if you get a good score he will ask if you have money to make your store big. And will give you money to make it 1 story bigger.