The password system in Mega Man 3 is fairly simple. The player places a dot on a specific coordinate to signify either that a Robot Master has been defeated or that they have a certain number of Energy Tanks. The only complication however, is the blue dots, which represent two Robot Masters.
Red dots indicate that a certain Robot Master has been defeated. The player should find the name of the level they would like cleared and place a red dot on the matching coordinate.
Gemini Man - B5 Doc Gemini Man - B6 Hard Man - C4 Doc Needle Man - B2 Magnet Man - F5 Doc Shadow Man - A4 Needle Man - D3 Doc Spark Man - A1 Shadow Man - D6 Break Man - E1 Snake Man - F6 Spark Man - F4 Top Man - A3
Blue dots represent specific pairs of Robot Masters. If the player wishes to have any of the following combinations cleared, they should not place a red dot for each one; instead, they should place a blue dot to clear them both. Note: If the player wishes to place a dot of either color for any Doc Robot levels, they must first place blue dots for all eight normal Robot Masters.
Gemini Man and Hard Man - B5 Magnet Man and Needle Man - D3 Shadow Man and Spark Man - F4 Snake Man and Top Man - A3 Doc Gemini and Doc Needle - B2 Doc Shadow and Doc Spark - A1
E Tank Dots
The last dot the player must place in any password determines how many Energy Tanks (from 0-9) they will begin with. This dot can be either color (but it will always be red on the passwords given at the end of the level).
0 - C5 5 - C1 1 - E6 6 - D2 2 - E4 7 - C3 3 - B4 8 - F2 4 - A5 9 - A6