Here is the best order to defeat the Mega Man 1 Robot Masters and their weaknesses

1. Cut Man (DLN-003)

• Weapon: Rolling Cutters
• Primary Weakness: Super Arm (Guts Man). You will have to use the Mega Buster at this point in the game.
  
• Other Weakness: Hyper Bomb & Fire Storm

2. Elec Man (DLN-008)

• Weapon: Thunder Beam
• Primary Weakness: Rolling Cutters (Cut Man)
• Other Weakness: Super Arm & Hyper Bombs
• You need to return for the Magnet Beam with either the Guts Man or Elec Man ability. (See video below)

3. Ice Man (DLN-005)

• Weapon: Ice Slasher
• Primary Weakness: Thunder Beam (Elec Man)
• Other Weakness: Hyper Bomb, Fire Storm & Rolling Cutters

4. Fire Man (DLN-007)

• Weapon: Fire Storm
• Primary Weakness: Ice Slasher (Ice Man)
• Other Weakness: Rolling Cutters

5. Bomb Man (DLN-006)

• Weapon: Hyper Bomb
• Primary Weakness: Fire Storm (Fire Man) and pausing/unpausing the game.
• Other Weakness: Mega Buster, Rolling Cutters & Thunder Beam

6. Guts Man (DLN-004)

• Weapon: Super Arm
• Primary Weakness: Hyper Bomb (Bomb Man) and pausing/unpausing the game.
• Other Weakness: Fire Storm

Dr. Wily’s Castle

1. Yellow Devil

• Weapon: Body
• Primary Weakness: Thunder Beam (Elec Man) and pausing/unpausing the game.
• Other Weakness: Mega Buster

2. Copy Robot

• Weapon: All weapons
• Primary Weakness: Fire Storm (Fire Man)
• Other Weakness: None

3. CWU-01P(s)

• Weapon: Bubbles
• Primary Weakness: Super Arm (Guts Man)
• Other Weakness: Mega Buster

4. Wily Machine No. 1

• Weapon: Blaster
• Primary Weakness: Fire Storm (Fire Man)
• Other Weakness: Mega Buster

 

Fun FAQ: The game’s level bosses are numbered with “DLN”, which is the acronym for Doctor Light Number.