I use to have a version of Jazz Jackrabbit 1 with episodes 2-4. It came on cd but had episodes 2-4 instead of episodes 1-9. It didn't have episodes 1 and 5-9 on it. The cd and everything looked looked entirely legit. I thought it was a normal version then I looked it up recently and apparently the game was released with various different episode sets but It didn't say anything about this particular one.