I don't see how everyone is saying that it's easy to get the hard badge. I collected it flashing shape at the very beginning of the song, avoided all red shapes, collected all yellow shapes that I found, and ended collected 85% of the shapes. I got up to a 99x multiplier and still got UNDER 3,000,000. Not ever close to 5,000,000. That last badge has turned this game from a relaxing game to a nightmare for me. I'm not even going to try anymore. Do I just have bad luck?
Most of the moral of the game sets in after you switch positions for around four times. After that, your opinion becomes gray and not either black or white. This time, no one will listen to you. Honestly, I don't think many people bothered to play it past that point, considering how repetitive the game is near the beginning.
At the last level, I had exactly one "shadow" standing at the ledge on the other side looking at me as I reached the green box/door. That almost made me start crying...
"Are you really leaving?"
 "Music Catch 2"){kind=icon}
 "Electric Box 2"){kind=icon}
 "Burger Restaurant 4"){kind=icon}
 "Doodle God 2"){kind=icon}
 "McDonald's Videogame"){kind=icon}
 "Gray"){kind=icon}
 "The Company of Myself"){kind=icon}
 "One Chance"){kind=icon}
I am glad you found the songs, very few people find the song in 31.