This is a fun game. The first of many Mega Man games. The only thing that bugs me about this game is how there are no password continues. You have to start at the very beginning every time you reset the system.
However, this is the only MM game where you can get unlimited energy. If you pick up energy and then leave the screen, you can go back and pick it up again! You can do this as many times as you want.
If you see this game, I recommend that you buy it! It may be expensive, but it's a classic.