3 Categories Of Factories

 

There are 3 levels of resource factories I,II,III each collecting more resources than the tier below it.

 

Oil Refiner III

Large-scale oil refiner. The oil production increases as long as you upgrade Oil Refineries.

 

 

Steelmaking Plant III

Large-scale steelmaking plant. The steel production increases as long as you upgrade Steelmaking Plants.

  

 

Farm III

Large-scale farm. The grain production increases as long as you upgrade Farms.