Requirements: level 15+

In this event, you open chests and receive guaranteed prizes from each of them.

There are 3 types of chests. Each type of chests requires a different number of keys and brings rewards on a random basis.

1. Standard chest. You need 9 keys to open a chest and you can open 45 standard chests in total. One of these 45 chests will bring you the main reward.
 
2. Enhanced chest. You need 18 keys to open a chest and you can open up to 30 enhanced chests. Enhanced chests contain fewer decor compared to standard chests. One of the 30 chests will bring you the main reward.  The chance to get the main reward is higher in enhanced chests than in standard chests. 
 
3. Super chest. You need 27 keys to open a chest and you can open up to 15 chests. Super chests contain no small decor and more buildings sold for seasonal currency and superbucks in the game shop compared to standard and enhanced chests. One of the 15 chests will bring you the main reward. The chance to get the main reward is higher in super chests than in standard chests.
 
It is up to you to decide what chest to open: standard, enhanced or super chest. 
You do not have to stick to one type of chests, you can open any chest you wish.

IMPORTANT! YOU CAN ONLY GET THE MAIN REWARD ONCE!

So, if you, for instance, opened a super chest and received the main reward, you will not be able to receive it again no matter how many standard chests and/or enhanced chests you open.
As soon as you receive the main reward in one of the chests, the possibility to obtain it in any further chest becomes blocked.
You can receive the main reward by opening any type of chests, but you can only get it once during the event.
 
The main reward is Grand Hotel Astoria in Mamaia, size 8x7, can be placed anywhere
4200 coins, 1-3 energy, 1-3 candies/baubles every 24 hours

Each chest can be opened with Autumn Keys (9, 18, or 27)
There are 3 ways to get the Keys:

1. Completing quests
Key quests will appear one after the other in the menu on the left side
 

Big Cleaning I
Collect 19 peacock feathers (Stationery Shop, Upgraded Stationery Shop)
Collect 5 planetary models (School, Valley School)
Collect 13 squibs (Recreational Cottage, Upgraded Recreational Cottage)

Big Cleaning II
Collect 17 feather dusters (Shoe Shop, Upgraded Shoe Shop)
Collect 11 coffee beans (Coffee House, Upgraded Coffee House)
Collect 8 sensors (Water Tower, Upgraded Water Tower)

Big Cleaning III
Collect 5 radars (Electronics Plant, Upgraded Electronics Plant, Electronics Megaplant)
Collect 34 ropes (Textile Factory, Upgraded Textile Factory, Textile Megafactory)
Ask friends for 7 joysticks

2. Collect profits from certain buildings:
Lighthouse: 1 key every 24 hours
Student Campus: 1 key every 12 hours
Mole Antonelliana: 2-3 keys every 24 hours
Church of St Anthony of Polana: 2-3 keys every 24 hours
Ignacio Portabella House: 2-3 keys every 24 hours
 
3. Purchasing keys from a special offer
 
Unique offer: Ignacio Portabella Housesize 6x6, can be placed anywhere
4000 coins, 1-4 energy, 2-3 keys during the promotion, 1-4 candies/baubles every 24 hours