Yeah, I was just picking through the files... the .lvl files are .j2l files... again... they don't work with JJ2 
I am too lazy to check if Battery Check and Animaniacs are compatible.
Do the tilesets from BC and Animaniacs work with JJ2? Obviously the music does.
I also noticed a fair amount of code in some of the files... can those be useful for us? 
Edit: I even tried adding the following text to the levels... with no result.
Jazz Jackrabbit 2 Data File
Retail distribution of this data is prohibited without
written permission from Epic MegaGames, Inc.
__________________
<img align="right" src="http://webpages.charter.net/jazzjackrabbit/sig/El-ahrairah.PNG" height="200"><table bgcolor="navy"><td><font face="Trebuchet MS" size="3" color="blue"><i>"El-ahrairah, your people cannot rule the world, for I will not have it so. All the world will be your enemy, Prince with a Thousand Enemies, and whenever they catch you, they will kill you. But first they must catch you, digger, listener, runner, prince with the swift warning. Be cunning and full of tricks and your people shall never be destroyed."</i>
- The Blessing of El-ahrairah, Watership Down
</font></table>
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