- You could give Jazz Swapper a try, but I suspect it only works for LEVEL#.### files because those were all that could be edited when it was released.
- The most basic way is to extract the custom level(s) into your JJ1 folder and overwrite the default files, after making sure you have a backup of everything.
- If the only files being overwritten are .000, .001, and .002, you can also install a shareware version, patch it accordingly to work on your computer, and overwrite the files there.
- If you don't have JJ1, and the files are of number higher than 002, and were made in J1CS (not J1E), you can use Openjazz.
- If they're of number higher than 002, they were made in J1E, and you don't have JJ1, conceivably you could use J1E and such to change all their numbers to something that the JJ1 shareware would read.
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