Some people think that Shatterhand is the epitome of NES gaming. I'm not quite sure that I agree.

But it's pretty tough, regardless, especially the boss fights. But there's a way you can practice them without having to go through the stages first.

First, go to the title screen

Then (quickly) press the following buttons:

A, A, A, A, B, B, B, B, A, B, A, B, A, B, A, B

Done quickly enough, you'll be taken to a screen loaded with goodies

You can hear any of the sounds the game has to offer or, more interestingly, you can play any of the bosses

But you don't have the aid of your little mech thing, so it's going to be a little harder than it could be. But practice enough it at, and it won't matter.