To get inside the Egg sans instruments, start at the entrance screen of L:8 - Turtle Rock. Go up a screen and use the Screen warping glitch. Move south a screen. If you exit the level, you didn't perform a perfect warp, so try again. If you have, then you'll be on the notorious unlimited Power Bracelets screen. Hop off of the walls and go down a screen, right a screen, down a screen, and then continue right until you get to the drop-off hole that leads to the final battle. Leap off of the walls there and into the pit to initiate the Final Battle. Good luck!
Submitted by Artemis251.