This mod replaces dirt 3 with a grimy mud substance. I think the title of this mod is somewhat misleading because the terrain doesent look like mud. But this terrain does look very good. I think that it is very useful for many things. For example it makes very convinceing "grime" for you to put in a poor quarter or slum in your city. This can also be used as ash from a volcano, or to help make a city that has been destroyed look more convincing (the perfect squares of rubble don't do a very good job) This terrain does a good job of mixing with most terrains but still has problems mixing with snow terrains because it is such a dry texture. It blends nicely with grass and fits in well with eyecandy. The artist did a good job of making the frames different and making it so they fit together and mix with other terrains well. Overall I would rate this mod as above average and suggest you download it as soon as possible.