No, it's a mistake. The game is actually called Ninja Rabbits II: The Buck Stops Here. It's a DOS game that was made in 1991, three years before Jazz Jackrabbit 1 came out, so that couldn't have anything to do with it. That, and the game is rather slow-paced compared to Jazz Jackrabbit. The difficulty is similar to that of JJ1 though. I can't beat level 2. X)