This is a side feature allowing you to make your ingame purchases more beneficial.

While this feature is on, items you buy on ingame sales earn you different amounts of stickers. You can then spend your stickers for a bigger discount in the event store.

The feature lasts 90 days, the event store will be open for another 3 days after the feature is over.

How to obtain stickers:

1. Check out a sale in the game. Each item on sale is assigned a specific number of stickers.

2. When you buy an item marked with a sticker icon, you get the number of stickers specified near this icon. Your earned stickers then appear in the feature window.

3. Accumulating stickers brings you closer to milestones. Each milestone brings you a reward.

4. Once you reach a milestone, don't forget to claim the reward. Click on the green button to claim it.

How to use stickers:

You can use stickers in the event store.

The event store has several buildings. Each building has several purchase options. 
- For unique buildings: you can use only one of the purchase options for each unique building. The more stickers you spend for an option, the bigger the discount. 

- For ordinary buildings: you can purchase the building several times applying different offers. But each particular offer can be purchased only once. Some of these offers also contain useful items.
 

New unique building:

Jackson Square
size 10x9, can be placed in all locations

10,000 coins, 3-4 energy, 15-20 Chefcoins, 1-3 candies/baubles every 24 hours
This building brings seasonal currency in autumn and in winter.

PLEASE NOTE! After you purchase an offer in the event store, the corresponding number of stickers will turn green in the Stickers tab. It means that you have used them and they have been deducted from your account.
Here you can see that the green stickers are the ones that have been earned and spent and the yellow ones are the ones that have been earned and not yet spent:

You can keep track of your stickers in the upper left corner of the feature window. It only shows the number of your active (yellow) stickers. These are the stickers you can spend in the event shop.