Just in case someone make the same mistake as me, here is how three levels ( took me over a week ) that I made, deleted, gone from the file forever. I was so upset I almost broke my keyboard.

So I made a file called ' R Jungle ' in level editor. Inside, I named the campaign, etc etc. Made four levels, saved the file. At this point all is good.

Today I decided, four levels might be too many for one custom campaign. I cannot find a way just to move one level ( or copy ) to a different campaign file. But I remember with Additive Load, I can load the levels into a different campaign file.

So I open file ' MissionImpossibro ' ( a campaign file I made with just one level inside ). I go to file , click on ' R Jungle ', then click ' Additive Load.

The four levels loaded into ' MissionImpossibro ' campaign file successfully, so far so good. But I only wanted to move one level, so I deleted three levels in MissionImpossibro, assuming these all four levels are still in ' R Jungle ' file. Then I click ' Save ' . In my mind, I deleted the levels in MissionImpossible , and not ' R Jungle ' .

I go to File, select ' R Jungle ' Click Load. To my horror, three levels are deleted, nowhere to be seen. I go to ' MissionImpossibro ', and the levels are not there too.

So, additive load function do not duplicate your levels from one campaign file to another campaign, but more like moved them over?

I am still in shock and very upset about it cause it took me long time to make those four levels. Perhaps I am stupid in misunderstanding how to use this properly , just hope noone else repeat my mistake.