Requirements: the chests will be received by players level 15+
Main reward is the Saint Patrick’s Cathedral (4,800 coins, 3-5 energy, 3-5 candies every 20 hours, size 6*8, can be placed anywhere except the Snowy Plateau)
Each chest can be opened for 9 Autumn keys.
There are 3 ways to get Keys:
1. Complete the quests:
Outdoors in Melbourne I (2 keys)
Collect 8 Sandwiches (Pub, Upgraded Pub)
Collect 3 Sprigs of Rosemary (Greengrocer’s Shop)
Collect 11 Cups of Tea (Coffee House, Upgraded Coffee House)

Outdoors in Melbourne II (2 keys)
Collect 31 Floats (Summer House, Upgraded Summer House)
Collect 9 Binoculars (Hostel, Upgraded Hostel)
Ask friends for 8 Graphic tablets 

Outdoors in Melbourne III (3 keys)
Collect 11 Screw Nuts (Subway Station, Upgraded Subway Station, Central Station, Eastern Station)
Collect 28 Pistons (Shoe Shop, Upgraded Shoe Shop)
Collect 4 Mechanics (College)

Outdoors in Melbourne IV (4 keys)
Collect 15 Pencils (Stationery Shop, Upgraded Stationery Shop)
Collect 3 Clothes Pegs (Launderette)
Collect 9 Palettes (from friends’ cities - buildings with a clock or coin)

2. Collect profits from the following buildings:

Supertanic Liner - 1 key every 24 hours;
Drive-in Theater - 1 key every 12 hours;
Museum of Applied Art - 1-3 keys every 18 hours;
Museum of Natural History - 3-5 keys every 20 hours;
Grauman’s Theatre - 2-4 keys every 18 hours;
Art Museum - 3-5 keys every 18 hours;
Center of Culture - 3-5 keys every 20 hours.

3. Use the sale offer!

Special offer with the Saint Patrick’s Cathedral chest event

Museum of Applied Art: 4,100 coins, 3-5 energy, 2-4 candies, 1-3 autumn keys during the Saint Patrick’s Cathedral chest event every 18 hours, size is 10*7, 80 marathon points one time when purchasing;
Museum of Natural History: 4,500 coins, 2-3 energy, 2-4 candies, 3-5 autumn keys during the Saint Patrick’s Cathedral chest event every 20 hours, 80 marathon points one time when purchasing;
Grauman’s Theatre: 3,800 coins, 2-4 energy, 2-4 autumn keys during the Saint Patrick’s Cathedral chest event every 18 hours;
Art Museum: 3,800 coins, 2-4 energy, 3-5 candies, 3-5 autumn keys during the Saint Patrick’s Cathedral chest event every 18 hours;
Center of Culture: 5,500 coins, 3-5 energy, 3-5 energy, 3-5 autumn keys during the Saint Patrick’s Cathedral chest event every 20 hours