What is the difference between the original Rocky game and Rocky Legends

Yah. I've never really been into boxing, though I am slowly starting to get into Rocky.
And this game is great. Even better than "Mike Tyson's Punch-out", if you ask me. And like Doh11 said, it's very addictive.
Once you start playing, you'll have a great difficulty putting the controller down again.

However, there seems to be a mistake in the IMDB-info. It was relased in 2004, not 2002.