Level 100+
In order to receive the new quest, you will have to purchase 2 land expansions behind the Weather station in the Snowy Plateau.
The quest steps are untimed, take as long as needed for restoring the Mystery Castle itself. However, if you manage to do it in 14 days since the moment you receive the offer on the right side of the screen, you will also get the Festive Confectionery as a bonus!
Festive Confectionery: 4,000 coins, 2-5 energy every 24 hours, size 4*4, can be placed in the Snowy Plateau
Mystery castle I
Buy an expansion
Collect 4 Tourist maps (Upgraded Rent-a-Scooter)
Collect 20 Love letters (Colonial House, Upgraded Colonial House)
Mystery Castle II
Collect 11 Shovels (from friends’ cities - buildings with a clock or coin)
Ask friend for 8 Repair Kits
Collect 10 Castle door keys (by completing tasks from map obstacles)
Mystery Castle III
Buy 2 expansions
Build 2 Auto repair shops
Build Petrol station
Mystery Castle IV
Collect 7 Nails (visit your friends' cities and click buildings with a coin or clock icon above)
Collect 8 Rakes (Summer House, Upgraded Summer House)
Collect 17 Castle door keys (by completing tasks from map obstacles)
Mystery Castle V
Buy 2 expansions
Build Shopping Center
Build Launderette
Mystery Castle VI
Collect 25 Saws (Colonial House, Upgraded Colonial House)
Collect 8 Screw wrenches (from friends’ cities - buildings with a clock or coin)
Collect 20 Castle Door Keys (by completing tasks from map obstacles)
Mystery Castle VII
Buy 2 expansions
Collect 5 Builders (College)
Collect 3 Designers (University)
Mystery Castle VIII
Ask friends for 8 Plastic pipes
Collect 15 Ropes (Textile Factory - all, Upgraded Textile Factory - Wool, Felt, Cashmere)
Collect 19 Castle Door keys (by completing tasks from map obstacles)
Mystery Castle IX
Build 2 expansions
Build Restaurant
Build Pizza House
Mystery Castle X
Collect 14 Axes (Upgraded Colonial House)
Collect 12 Brushes (Fashion Boutique, Upgraded Fashion Boutique)
Collect 22 Castle Door Keys (by completing tasks from map obstacles)
Mystery Castle XI
Buy 2 expansions
Build Luxury Apartment
Build Villa with a pool
Mystery Castle XII
Collect 22 Fertilizers (Farm, Upgraded Farm - Beetroot)
Collect 21 Watering Cans (Ranch, Upgraded Ranch)
Collect 21 Castle Door Keys (by completing tasks from map obstacles)
Mystery Castle XIII
Buy 2 expansions
Collect 3 Engineers (University)
Collect 2 Architects (University)
Mystery Castle XIV
Ask friends for 9 Almond Butters
Collect 6 Rubber boots (Luxury Apartment)
Collect 20 Castle Door keys (by completing tasks from map obstacles)
Mystery Castle XV
Buy 2 expansions
Build 3 Hostels
Collect 3 Mechanics (College)
Mystery Castle XVI
Collect 9 Shovels (from friends’ cities - buildings with a clock or coin)
Collect 6 Wooden beams (Cargo Port)
Collect 27 Castle Door keys (by completing tasks from map obstacles)
Mystery Castle XVII
Buy 2 expansions
Collect profits from Swedish Skyscraper 2 times
Collect profits from Summer mansion 6 times
Mystery Castle XVIII
Produce 3 lots of Tapestries (Upgraded Creative studio)
Collect 8 Coffee tables (Furniture Factory)
Collect 29 Castle Door keys (by completing tasks from map obstacles)
Mystery Castle XIX
Buy 3 expansions
Produce 8 lots of Bathtubs (Construction Factory)
Collect 4 Chaise lounges (Furniture Factory)
Mystery Castle XX
Collect 5 Aquariums (Aquarium Shop, Oceanarium)
Collect 28 Welcome mats (Shoe Shop, Upgraded Shoe Shop)
Collect 45 Castle Door keys (by completing tasks from map obstacles)