Requirements: the chests will be received by players level 15+

The main reward is the Ksiaz Castle (4,300 coins, 1-5 energy, 1-4 Pearls every 24 hours, size 9*10, can be placed anywhere)

Each chest can be opened for 9 Summer keys.

There are 3 ways to get Keys:

Completing the quest:

Renovations in the City I (3 keys)
Collect 5 Seals (Administration)
Collect 7 Dresses(Tailor's Workshop)
Collect 8 Shovels (helping in friend's city, do not drop every time)

Renovations in the City II (3 keys)
Collect 15 Tropical flowers (Bungalow Deluxe, Upgraded bungalow deluxe)
Collect 8 Pumps (Water tower, Upgraded water tower)
Ask friends for 6 Scarves

Renovations in the City III (4 keys)
Collect 15 pans (Hostel, upgraded Hostel)
Produce 10 cucumber(farm)
Collect 13 valves ( Collect profit from Premium Cottages)

2. Collect profits from the following buildings:

Lighthouse 1 key every 24 hours;
Scout Camp 1 key every 12 hours;
Fisher Library 2-4 keys every 23 hours;
Balmoral Castle 2-3 keys every 24 hours
Royal Liver building (sale offer) 2-3 keys every 23 hours

3. Use the sale offer!