Defeating the Bosses
Guts man: Regular shot, jump over his stones.
Cut Man: Use the Guts power to throw the stones underneath the door at him. Score both hits, and he will be defeated. Note: You can only do this once, so make it count.
Elecman: Use Cut scissors
Ice man: Use Elec shot
Fire Man: Use the Ice shot not only on Fireman, but to freeze obstacles that you tend to run into throughout the stage.
Bombman: Use Fire Shot
Alternately, use this order.
Bombman: Use the Arm Cannon (Mega Man's weapon).
Gutsman: Use Hyper Bombs (Bombman's weapon).
Cutman: Use Super Arm (Gutsman's weapon) to lift the blocks up.
Elecman: Use Cut Blade (Rolling Cutter) (Cutman's weapon).
Ice Man: Use Elec Beam (Elec Man's weapon). Pause and resume the game by pressing "Select" repeatedly.
Fire Man: Use Ice Slasher (Ice Man's weapon). This can also freeze the fire that appears in some sections of this stage, which will allow you to reach places that Mega Man cannot.
Defeating Bubbles
The Bubbles are located on the third stage of Dr. Wily's Fortress. Hit the slow Bubbles with the Arm Cannon (Mega Man's weapon), then use the Super Arm to pick up the blocks and throw them at the fast Bubbles.
Defeating the Clone of Mega Man
The Clone of Mega Man is located on the second stage of Dr. Wily's Fortress. Hit the Clone with the Elec Beam (Elecman's weapon) or Hyper Bombs (Bomb Man's weapon) and use the "Extra damage" trick.
Magnet Beam
The Magnet Beam is found in Elecman's Stage. You need to use Gutsman's Super Arm to break some big blocks to reach it, or you can use Elecman's Elec Beam. The Magnet Beam is a step that Mega Man can use to reach places that he normally cannot go to. This is useful in Iceman's Stage and is required to get through a section in the first Stage of Dr. Wily's Fortress.