.

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

The main reward is the Sanatorium Ordzhonikidze (4,200 coins, 2-3 energy, 2-4 glass baubles every 23 hours, size 10*10, can be placed anywhere)

Each chest can be opened for 9 Winter keys.

There are 3 ways to get Keys:

Completing the quest:

Professor Party I (3 keys)

Ask friends for 6 Winter hats
Collect 23 Water bottles (Wok Cafe, Upgraded Wok Cafe)
Collect 22 Paper tapes (Bakery, Upgraded Bakery)

Professor Party II (3 keys)

Collect 14 Amber earrings (Premium Cottage)
Collect 14 Envelopes (Subway station, Upgraded Subway Station)
Collect 27 Fertilizers (Farm, Upgraded Farm - Beetroot)

Professor Party III (4 keys)

Collect 7 Spiders (from friends’ cities - buildings with a clock or coin)
Collect 5 Hockey sticks (School, Valley School)
Collect 28 Carnival masks (Mansion)


2. Collect profits from the following buildings:

Supertanic Liner - 1 key every 24 hours;
Windmill - 1 key every 18 hours;
Oxford Lloyds Bank - 2-4 keys every 23 hours;
Powder Tower - 2-3 keys every 23 hours;
LUMA Arles - 1-4 keys every 24 hours.


3. Use the sale offer!

Special offer with the Sanatorium Ordzhonikidze chest event

LUMA Arles: 4,400 coins, 1-3 energy, 2-4 glass baubles, 1-4 winter keys during the Sanatorium Ordzhonikidze chest event every 24 hours;
Powder Tower: 4,200 coins, 2-3 energy, 1-4 glass baubles, 2-3 winter keys during the Sanatorium Ordzhonikidze chest event every 23 hours;
Oxford Lloyds Bank: 4,100 coins, 1-4 energy, 1-4 glass baubles, 2-4 winter keys during the Sanatorium Ordzhonikidze chest event every 23 hours;
Bremen City Hall: 3,900 coins, 3-4 energy every 24 hours;
Rocchetta Mattei: 4,500 coins, 2-4 energy every 23 hours;
Plawniowitz Castle: 4,700 coins, 2-4 energy every 24 hours.