Commodore 64: Marble Madness: recreating the protection or skipping it completely. By Zibri / RamJam
Copy this d64 on a floppy disk.
Marble Madness D64
Then insert disk into the drive and:
RUN
WP.PRG will write the protection track on track #2.
Then insert disk into the drive and:
RUN
The result is a perfect master or a unprotected copy of Marble Madness and 100% working as the original.
Mission accomplished.
For a detailed description on how I did this, please read: How I did it