Tower of Spirits (To Retrieve Compass of Light)

Zelda ST Walkthrough - Tower of Spirits on your sixth visit to obtain the Compass of Light.

Walkthrough

Climb up the tower to reach where Malludus was resurrected. Shoot two eye-shaped switches with the Bow of Light. The stairway leading down to Floor 30 will appear.
Proceed through another dungeon. You've got the Lokomo Sword this time, so you don't have to enhance your sword with Tears of Light anymore. When you come across a Phantom, hit it in the back to have Zelda slip into it.
Obtain the Compass of Light in the last room. The Railmap of Forest Realm will begin to glow ominously. New tracks will appear at the southwest of Forest Realm.
After obtaining Compass of Light, you'll receive a letter from Ferrus when you pass by a post.
Head for Dark Realm via newly appeared tracks.