After the sequel had been released with a password system, there was a rumor that you could access a password screen in the first game by either holding a certain button combination or inputting a code on the title screen.
There is a secret boss somehow accessible via the Bubbleman stage. If you beat it, you will be automatically teleported to the end of the game.
Based on a truth; while there technically is no secret boss, there *is* a glitch that can be performed in Bubbleman's boss room by shooting multiple Item 1 platforms and then trying to go backwards out the door. If done correctly, with exact timing, the player will teleport into a glitched-up version of a room from one of the Wily stages, where he or she can fight a deformed Bubbleman that's entrapped in the wall.
You can slide in this game. The "reason" you can't at the start of the game is because Megaman was crippled and his feet are too flat to slide. If you beat the game fast enough Dr. Light will fix Megaman up and he'll be able to slide the next time you play.
Numerous people have looked inside the game's programming. No code relating to sliding exists.
You can unlock an NES version of the game and play with the old graphics instead of the new SNES graphics and physics.
There is no code for this in the game, however a fan-made version which is essentially Megaman 7 on the NES currently exists
There is a rumor that Cut Man is a secret boss in this game because he makes a brief appearance on the newspaper in the introduction story. This rumor is further strengthened by the fact there is a blank space in the weapons menu, possibly for Rolling Cutter. However, it is more likely this space was for Beat before he became a recovery item.