|Secret Mission 09: A Lonely Staircase|
|Acquire the Blue Orb at the end of the stairway of death.|
Several Sargasso will be conveniently arranged in a staircase type pattern and, most importantly, will not attack you on Normal or lower difficulty. You have to jump up their heads to the top. It may take a few tries, but you'll get there with patience.
If you find yourself overshooting the orb by using the last skull, air raid may be of assistance.