A free mod for Stardew Valley, by Mel Noelle and Kirbylink.
What is Underdark Sewer? It's a mod that overhauls the sewer and makes it look darker.
Sewer is a very important part of the game, because it's where you get your materials from. In addition, it's also where you go to find the different items that you need to survive. So it's a very important part of the game.
Installation:
Download and unzip the file.
Then, open the file and go to the directory that has the map.
After that, you will have to find the map file. You will find it in the folder that has the game.
