Acquiring the Rush Jet Adaptor
The Rush Jet Adaptor is earned by Mega Man after any five Robot Masters are slain instead of getting the Rush Jet Adaptor when defeating a specific Robot Master and assimilating the skill along with that Robot Master's weapon. When the fifth is killed, Roll and Auto will automatically give Mega Man this adaptor.
Boss Order/Preferred Weapon to Use
This is the suggested order/preferred to defeat the Robot Masters in, as well as which weapons to use on both them and the bosses in Dr. Wily's castle:
Plug Man - Use Jewel Satellite.
Tornado Man - Use Plug Ball.
Galaxy Man - Use Mega Buster.
Jewel Man - Use Black Hole Bomb.
Magma Man - Use Tornado Blow.
Hornet Man - Use Magma Bazooka.
Splash Woman - Use Hornet Chaser.
Dr. Wily #1 - Use Mega Buster.
Dr. Wily #2 - Use Mega Buster.
Dr. Wily #3 - Use Plug Ball.
Concrete Man - Use Laser Trident.
Wall Shooters - Use Mega Buster.
Giant Machine - Use Laser Trident.
Blob Monster - Use Black Hole Bomb.