To the left of the Ancient Tomb is the Oasis. It has several upgrade stages.
At the very beginning, restoring the Oasis will allow you to collect profit from it.
The quest to restore it consists of 10 stages. Completing tasks is not limited in time.
Stage 1
Collect 15 units of water (Water Tower, Upgraded Water Tower)
Collect 18 sandwiches (Pub, Upgraded Pub)
Collect 20 pairs of shoes (Shoe Shop, Upgraded Shoe Shop)
Stage 2
Collect 20 umbrellas (Subway Station, Upgraded Subway Station)
Collect 25 sun creams (Cosmetics Boutique)
Аsk friends for 12 sunglasses
Stage 3
Collect 25 shovels (in friends’ cities)
Collect 15 dowsing rods (Genie's Palace)
Аsk friends for 15 drills
Stage 4
Collect 5 concrete slabs (Cargo Port)
Collect 10 reinforcements (Cargo Port)
Аsk friends for 10 plastic pipes
Stage 5
Collect 30 straw hats (Family House, Upgraded Family House)
Collect 15 watering cans (Ranch, Upgraded Ranch)
Collect 35 fertilizers (Farm, Upgraded Farm, Megafarm when you harvest beetroot)
Stage 6
Collect 40 saplings (Summer House, Upgraded Summer House)
Grow 10 crops of coconuts (Fruit Farm, Upgraded Fruit Farm)
Аsk friends for 15 cherry seedlings
Stage 7
Collect 35 packs of seeds (Flower Kiosk, Upgraded Flower Kiosk, Flower Megamarket)
Collect 30 barrows of soil (Farm, Upgraded Farm, Megafarm when you harvest squashes)
Ask friends for 12 garden scissors
Stage 8
Train 4 builders (College)
Collect 18 bricks (Cargo Port)
Produce 60 lots of concrete compound (Construction Factory, Upgraded Construction Factory, Construction Megafactory)
Stage 9
Produce 30 lots of linen (Textile Factory, Upgraded Textile Factory)
Collect 25 strong ropes (Kindergarten)
Collect 20 jugs (Bakery, Upgraded Bakery)
Stage 10
Collect 30 excursion tickets (in friends’ cities)
Collect 10 hearts (Wedding Palace, Film Set, “Love” Reality Show)
Collect 15 trophies (Stadium, Volleyball Court, Tennis Court)
After completing all 10 stages, the Oasis will bring you profits:
650 coins, 5-11 energy every 12 hours.