Mega Man 3's password system may look pretty complicated, but it's actually pretty easy to figure out. For example, it uses the placement of a single red dot to record how many Energy Tanks you have, and you can totally use this to your advantage.
For example, take this code that I got for having beaten no Robot Masters and having no Energy Tanks.

Consulting the chart below, I know that a single red dot in square C5 means 0 Energy Tanks. From there, it's a simple matter of moving that dot up to A6

To start the game with 9 Energy Tanks, the maximum!

From there, it's a simple matter of recording your password, moving the dot, and continuing on each time you need a refill!
And here's the list of dots and their Energy Tank attributes
# Dot Position
0 C5
1 E6
2 E4
3 B4
4 A5
5 C1
6 D2
7 C3
8 F2
9 A6






