Requirements: the chests will be received by players level 15+
Main reward is the Old Water Tower (3,850 coins, 2-4 energy, 1-3 glass baubles, size 6*7, can be placed anywhere)
Each chest can be opened for 9 Ice keys.
There are 3 ways to get Keys:

1. Complete the quests:
Treasure Hunting I (3 keys)
Collect 25 Levers (Textile Factory - all, Upgraded Textile Factory - Wool, Felt, Cashmere)
Collect 25 Sheets of Metal (Construction Factory - when producing Roof)
Collect 15 Trowels (Subway Station, Upgraded Subway Station)

Treasure Hunting II (3 keys)
Collect 40 bandages (German House, Upgraded German House)
Collect 24 Maps of the stars (Stationery Shop, Upgraded Stationery Shop)
Ask friends for 9 Cords

Treasure Hunting III (4 keys)
Collect 45 Runes (Family House)
Collect 18 Scrolls. Drops randomly (Mansion)
Collect 8 Magic 8 Balls (Pool Parlour, Upgraded Pool Parlour)

2. Collect profits from the following buildings:

Sweet Store - 1 key every 16 hours;
Thean Hou Temple - 2-3 keys every 22 hours;
Wightwick Manor - 2-3 keys every 22 hours;
Pennsylvania Academy of Arts - 1-4 keys every 22 hours;
Basilica of the Sacred Heart - 2-3 keys every 20 hours;
Supertanic Liner - 1 key every 24 hours.

3. Use the sale offer!


Special Offer with the Old Water Tower chest event

Pennsylvania Academy of Arts: 3,850 coins, 1-3 energy, 2-4 glass baubles every 22 hours, 1-4 icy keys during the Old Water Tower chest event, 150 marathon points one time when buying, size 6*8, can be placed anywhere;

Basilica of the Sacred Heart: 3,700 coins, 2-3 energy, 1-4 glass baubles every 20 hours, 2-3 icy keys during the Old Water Tower chest event, 150 marathon points one time when buying;

Antwerp Central Station: 4,100 coins, 3-4 energy, 2-5 glass baubles every 22 hours, 1-4 icy keys during the Old Water Tower chest event, 75 marathon points one time when buying;

Thean Hou Temple: 4,200 coins, 2-4 energy, 2-4 glass baubles every 22 hours, 2-4 icy keys during the Old Water Tower chest event, 74 marathon points one time when buying;

Wightwick Manor: 4,100 coins, 1-4 energy, 2-3 glass baubles every 22 hours, 2-3 icy keys during the Old Water Tower Chest event, 75 marathon points one time when buying;