Requirements: level 15+
In this event, you can open chests and receive guaranteed prizes from each of them.
There are 45 chests in total and rewards drop on a random basis.
The main reward is Opera de Nice, size 7x8, can be placed anywhere
Every 24 hours: 4200 coins, 1-3 daffodils, 1-3 energy

Each chest can be opened with 9 Spring Keys
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
Rock Festival I
Collect 8 planks (Cargo Port)
Collect 14 backpacks (Summer House, Upgraded Summer House)
Collect 6 air balloons (in friends' cities)
Rock Festival II
Collect 14 packs of seeds (Flower Kiosk, Upgraded Flower Kiosk)
Collect 14 towels (Recreational Cottage, Upgraded Recreational Cottage)
Collect 17 valves (Premium Cottage)
Rock Festival III
Collect 13 pistons (Shoe Shop, Upgraded Shoe Shop)
Produce 26 lots of parquets (Construction Factory, Upgraded Construction Factory)
Ask friends for 6 ancient books
2. Collect profits from certain buildings:
Supertanic: 1 key every 24 hours
Windmill: 1 key every 18 hours
Malmo City Library: 2-3 keys every 24 hours
San Carlo alle Quattro Fontane: 2-3 keys every 24 hours
Căpriana monastery: 2-3 keys every 24 hours
3. Purchasing keys from a special offer
Unique offer:  Malmo City Library, size 6x6, can be placed anywhere
Every 24 hours: 4000 coins, 1-4 daffodils, 1-4 energy, 2-3 keys during the promotion