This is one of my old school favorites.
The only bad thing about this game is that you dont get enough lives to make it through the entire game. There have been so many occassions that I have played through the game and died on the final boss with no continues and no lives left. Even then I still continue to play this game like it was brand. I really wish that Sega would continue this series like they did with Ninja Gaiden. The only catch to the update is that they would need to keep the original game play and just update the story line and graphix.