Purple:
Orange:
Blue:
Red:
the only ones that aren't displayed on the playlist are Pink and Yellow, and both of them are hidden in STUPID locations.
Pink: After you defeat the miku, in the top left corner, yea enough said, you have to jump into the blocks that faded away without you knowing, easier to do then explain.
Yellow: I believe you have to press F right outside the boss room, that's what the cherries are for, get confirmation on that.
The videos up top i take NO credit for, its all from guiadeiwannas1
sorry for the long post