To unlock this quest, you need first to:
- upgrade the Trader's Tent to level 5
- upgrade the Jeweler's Stall to level 4
- upgrade Apprentice's Workbench #1 and 2 to level 2
- build Apprentice Workbench #3 and upgrade it to level 2
- upgrade the Glassblower Stall to level 3
- upgrade the Tailor's Tent to level 2
- upgrade the Carpenter's Tent to level 2
The quest to restore the Lost City is called "City of Sands".
It includes 15 stages with a time limit.
Stage 1 (24 hours)
Collect 36 take-out boxes (Wok Cafe, Upgraded Wok Cafe)
Collect 39 spring rolls (Bistro, Upgraded Bistro)
Collect 28 bags of chips (Farm, Upgraded Farm, Megafarm when harvesting potatoes)
Stage 2 (24 hours)
Collect 4 embroidered dressing gowns (Tailor’s Tent)
Collect 5 crystal dishes (Glassblower Stall)
Collect 3 bejeweled trunks (Carpenter’s Tent)
Stage 3 (24 hours)
Collect 25 engines (Petrol Station, Upgraded Petrol Station)
Collect 9 wheels (Auto Repair Shop)
Collect 35 cabins (Subway Station, Upgraded Subway Station)
Stage 4 (24 hours)
Collect 7 сut gems (Jeweller’s Stall)
Collect 6 jewelry casings (Apprentice’s Workbench)
Collect 3 scarabs (Ancient Tomb)
Stage 5 (24 hours)
Train 4 engineers (University)
Ask friends for 15 winches
Collect 26 ropes (Textile Factory when collecting wool, tulle, denim, printed cotton, linen, Venetian lace, silk, velvet, lace; Upgraded Textile Factory when collecting wool, felt, cashmere)
Stage 6 (24 hours)
Collect 10 work tools (Cargo Port)
Collect 9 tool kits (Shopping Center)
Collect 7 sets of parts (Trader’s Tent)
Stage 7 (24 hours)
Collect 4 strong ropes (Kindergarten)
Produce 19 lots of silk (Textile Factory, Upgraded Textile Factory)
Collect 37 wooden beams (Cargo Port)
Stage 8 (24 hours)
Collect 23 shovels (in friends’ cities)
Collect 31 feather dusters (Shoe Shop, Upgraded Shoe Shop)
Collect 13 sun creams (Cosmetics Boutique)
Stage 9 (24 hours)
Collect 10 pumps (Water Tower, Upgraded Water Tower)
Ask friends for 12 plastic pipes
Collect 27 valves (Premium Cottage)
Stage 10 (24 hours)
Produce 32 tiles (Construction Factory, Upgraded Construction Factory, Construction Megafactory)
Collect 5 gold ingots (Apprentice’s Workbench level 2)
Collect 6 ebony blocks (Trader’s Tent)
Stage 11 (24 hours)
Collect 5 lucky coins (Guardian of the Valley)
Collect 4 books (School, Valley School)
Collect 4 magic 8 balls (Pool Parlour, Upgraded Pool Parlour)
Stage 12 (24 hours)
Collect 18 coloured bulbs (Summer Mansion)
Collect 31 jasmines (Flower Kiosk, Upgraded Flower Kiosk, Flower Megamarket)
Collect 15 air balloons (in friends’ cities)
Stage 13 (24 hours)
Collect 5 cushions (Wooden House)
Collect 3 chaise lounges (Furniture Factory)
Produce 14 lots of velvet (Textile Factory, Upgraded Textile Factory)
Stage 14 (24 hours)
Collect 27 invitations (Stationery Shop, Upgraded Stationery Shop)
Train 2 architects (University)
Collect 21 microphones (Pub, Upgraded Pub)
Stage 15 (24 hours)
Produce 10 toffee apples (Candy Factory, Upgraded Candy Factory)
Collect 12 ring cakes (Bakery, Upgraded Bakery)
Collect 18 dragon fruits (Fruit Market)