You can expand your store by clicking on the blue arrows around the perimeter of your store:



Once you've expanded your floor as far as it will go, you can unlock a new story/floor, provided you have a staircase. The staircase can be assembled from the staircase kit once you've bought all expansions for the ground floor. Each floor, once initially purchased, has 5 expansions.

Sooner or later, you're bound to run out of room. After all animals need their space, and shelves and racks want to be put somewhere too. More room will allow you to buy more animals, more pens, more decorations, ... all of which means more customers!

The staircase allows you buy the next floor, and to switch floors, and is therefore necessary to have any other floors (except the basement - it's magical). Once you've bought all the expansions for a floor, you can buy new floors over the staircase/elevator.

With the staircase, you can only go from one floor to the floor above or below it; with the elevator, you can go to any floor of your choice with a single click. So instead of going from the basement to the first floor, to the second floor, to the third floor, you can just zip from the basement to the third floor. Upgrading the staircase to an elevator costs 250 Diamonds.

You can upgrade your staircase by clicking on the staircase and then the elevator symbol on the left upper corner:



NOTE: Buying the elevator does NOT buy you an additional floor in your store.