Allright, so i make a map in polyworks, and it looks like this:
http://img129.imageshack.us/my.php?image=untitled1hd.gif

But when i compile it, and play it, it looks like this:
http://img129.imageshack.us/my.php?image=untitled24kh.gif

The Ground becomes fuzzy and looks like everything is like grass
any idea on how to prevent that?

You're using a texture with large edges. To solve this problem, make a copy of the texture you are using, then load that for your map.

Personally, I think it looks fine with the edges. The map is quite nice too.

Duplicate the texture file, which you use for the map, in your File Browser and give it an unique name. And then use that texture in your Map.