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 Church of our Saviour size 6*7 can be placed anywhere
Every 24 hours:
4200 coins
1-3 energy
1-3 daffodils

Each chest can be opened with 9 Spring keys

There are 3 ways to get the Keys:

1. Complete the quests.

Closed Jewelry Box I (3 keys)
Collect 17 Maps of the Stars - Stationary shop, Upgraded Stationary shop
Collect 31 Ropes - Textile Factories (when you collect wool, tulle, denim, printed cotton, venetian lace, silk, velvet), Upgraded Textile Factories (when you collect wool, cashmere, felt)
Collect 24 Saws - Colonial House, Upgraded Colonial House

Closed Jewelry Box II (3 keys)
Collect 33 Saplings - Summer House, Upgraded Summer House
Collect 14 Planks - Cargo port
Collect 26 Fertilizers - Farm and Upgraded Farm when you harvest beetroot.

Closed Jewelry Box III (4 keys)
Collect 14 Screw nuts - Subway Station, Upgraded Subway Station, Station, Central Station, Eastern Station
Collect 11 Screw wrenches- Friends cities with clock or coin, do not drop every time
Ask friends for 7 Repair kits

2. Collect profits from certain buildings:

Supertanic liner  1 key every 24 hours
Windmill 1 key every 18 hours
Myeongdong Cathedral 2-3 keys every 24 hours
San Carlo alle Quattro Fontane 2-3 keys every 24 hours
St. John's Anglican Church 2-3 keys 24 hours

3. Use the sale offer

Unique offer:
San Carlo alle Quattro Fontane size is 5*5 can be placed everywhere.
Every 24 hours:

4000 coins
1-4 energy
1-4 Daffodils
2-3 Spring Keys  during the promotion