Hi, I'm new to the forum and I registered to ask about the level editor. How to make a background for the level editor to load it?
By the way, I know this is old, but I like worms so I need to know :)

open paint (or other graphics program)
set resolution to 1920x696 (in paint, image-->attributes-->set width to 1960, set height to 696)
draw! (note: black is background)
save image in worms world party\user\import as a bmp
open up your landscape and play!

Erm, as I understand it he was asking how to import custom backgrounds, not levels. I thought I remembered reading something about being able to do it, but I don't know where. Sorry I can't be more help.

etho made a nice program for wwp that adds support for colour maps and i think custom backgrounds.