The text file for the hints says this
-The more Rock-ish the music is, the more hard is that section of the level
--->first section, use the ghosts
--->second section, nothing to say
--->third section, the hint is already given
--->fourth secion, you may have to be reallllly fast at the bottom, yeah, and really clever at the start, yeah, quick and clever, just like me, yeah.
--->fifth section, just don't do drugs -sonic
--->sixth section, just try and retry
--->seventh section, just kill yourself with the shell at the bottom, by tossing it to a wall with yoshi
First Comment is true.
The first section did not require the erries to jump at all.
The second section made me think to spin jump as peach. The solution was really avoiding the saw with Peach's hover.
The third section was skipable.
The fourth section took a lot of time, but once I figured out the pattern, it was quite easy and fun.
The fifth section was more boring with no background. The hint is useless.
The sixth section is weird, but is possible.
The seventh section, the section looks possible, but I still can not do it yet. It is possible as soon as I can get the player Yoshi swap down. I switch to the blue Yoshi in section seven, but could not fall fast enough to get to the shell fast enough. I will get back to you on that though.