By using the in the previous guides explained techniques (zipping and wall climbing) it is possible to skip the boss fights in round 2 and 3 and simply proceed to the next stage without having to fight the bosses.

Round 2-3:

• get in to the ceiling like in the video

• make sure that your feet are aligned with the black line like here ->

• initiate a zip and try to stop the zip by pressing "select" somewhere in between the red lines marked in this picture

• once you stopped in the marked area hold "select" and press "A" three times to rise higher

• press right for 31 frames to start zipping again and once you reach the wall press "start" two times to pause and unpause the game (pausing and unpausing the game for some reasons make the skip work every time)

• press "A" to jump and trigger the end of the stage

If you did everything correctly you will die after the "alert" screen and continue with 3-1

Round 3-3:

• position yourself like in this picture and shoot a broom

• jump on the broom and get in to the wall and start to wall climb until you reach this point

• by quickly alternating between left and right you can move to the left, wiggle a bit to the left but not too far otherwise you will hit invisible spikes and die

• hold "select" and press "A" five times to rise higher

• if you reach the point marked in the picture hold "select" and press "A" to trigger the end of the stage

(Sources: https://www.youtube.com/user/TheSuperSNES/videos, http://www.tasvideos.org/596M.html )