Thanks everyone, highly informative. However, I still don't get the version mess.

Regarding JJ1:
I currently have the version which consists of nine levels, PLUS - a level called "Holiday Hare" and additional bonus levels. When exiting, a screen pops up saying "THIS IS NOT A SHAREWARE! DO NOT DISTRIBUTE!" And beneath there's a line saying "Jazz Jackrabbit Commercial Version". So, what version do I have?

Another thing I don't get is the Holiday Hare episode. There's a spin-off called "Holiday Hare 95" and there's that episode built-in the game. Why?

Regarding JJ2:
I can play 4 episodes, with Jazz or Spaz. I can play MP (Party-Mode) either, but I couldn't find a level editor (=JCS) anywhere in the dictionary. What version is it?

On a side note... My Sound-card is relatively new, especially considering it's a years old DOS game. Couldn't get it to work with DOSBox though, do I need it on a CD or something?

Thanks in advance!