Lighthouse is available in City Center at level 25.

Quest Steps

Step 1/7:
Fill the businesses with goods 20 times
Produce 300 goods
Collect 8 Stars (Club, Concert Hall)
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Step 2/7:
Collect 7 Barrows of soil (Farm => Squash)
Collect 3 Bricks (Cargo Port)
Collect 3 Bricks (Cargo Port)
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Step 3/7:
Help your friends with 35 buildings
Produce 15 lots of Squashes (Farm)
Collect 8 Trophies (Tennis Court, Volleyball Court, and Stadium)
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Step 4/7:
Earn 35000 coins
Collect profits from Pub 7 times
Collect 8 Trophies (Tennis Court, Volleyball Court, and Stadium)

Step 5/7:
Collect 16 Green Paints (Flower Kiosk)
Collect 20 Ropes (Textile Factory => any)
Collect 12 Nails (friends’ cities, random drop)
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Step 6/7:
Produce 2 lots of Web Cameras (Electronics Plant)
Produce 15 lots of Linen (Textile Factory)
Ask friends for 5 Life jackets
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Step 7/7:
Produce 7 lots of Windows (Construction Factory)
Collect 3 Lightbulbs (Electronics Factory => Mouse)
Ask friends for 6 Searchlights
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Your rewards: 500 coins, 5 XP points, and 3 Superbucks