1. Download your desired custom level. (i. e. tampa)
2. Hit start and type "%localappdata%" (without "" but including the %) and hit enter
3. Go to "THUG Pro/User/Data/Pre/" and extract the three .prx files into this folder
4. Rename them: brun_scripts.prx -> tampa_scripts.prx, burncol.prx -> tampacol.prx and burnscn.prx -> tampascn.prx
5. Go back to the User folder (which contains the Data folder)
6. Put
> This < in there
That's it.
Tampa is just an example, you can do this with any level, just replace every "tampa" with how you want to call the level-files. (including the tampa.level.json filename, its contents and the three .prx files)
Editing the *.level.json:
Just change line 2 to whatever you want:
"level_name": "NameDisplayedInTheLevelSelectMenu",
and replace "tampa" at line 9, 10 and 11
"level_pre": "tampa_scripts.pre",
"level_scnpre": "tampascn.pre",
"level_colpre": "tampacol.pre",
I hope this is clear enough, if not, ask away!