Guys! if you don't already know, you don't have to get all of the 150 mistakes before it starts on the one song, it carries over from each game. So, you could play 150 times and get 1 mistake before the song starts every single time and get the achievement. The developer said so himself. :P
OK everyone listen! If you want to vs the dark guitar maniac, play the song which the purple skull and cross bones come up. Once you have finished the song, it will be on a different song. Keep playing songs which have them until they go on "I just wanna burn". Then, once you go into it, there he is.
wtf? i was going down the ramp (i have the omega coil) and i held the right button. when it had that bar which u r meant 2 get green on, i fell off the ramp and started flipping on the ground. i killed the 3 1st obstacles b4 falling into the water.
More-so than shooting a fireball out of your hands? :)