Increase expansion radius
The "Increase expansion radius for metropolises" feature allows you to connect cities from larger distances to your metropolis center.
As soon as you created a metropolis center, you see all possible habitats in the predefined radius. Now you have the possibility to increase this radius by a certain value (12), so that you can link habitats from lager distances to the metropolis center. The usage of the feature requires Gold Coins (2500).
The increase of the radius is just temporary (12h), so you have just a few hours to start the link process of a chosen habitat that would usually lie out of range. Once the link process is started, it will not be canceled after the runtime of the increased radius has ended.