GRMAP001
WIDTH 2
HEIGHT 2
LEVELNAMES
"era_nbkhideout_a1.nw","era_nbkhideout_b1.nw", "era_nbkhideout_a2.nw","era_nbkhideout_b2.nw"
LEVELNAMESEND

I guess that would be the .gmap file and the levels are easy to make and just add in