The witch's castle can beaccessedhrough the maze at Grimwood Forest. Enter the maze from the west and make your way northeast. A cave must also be found. This will take you to the Sunstone. The Sunstone should be used to kill the witch, but does not always work. You can kill the witch with any missile weapon, as long as you avoid her gaze. Once you kill her, get the Golden Lasso to ride the Golden Swan.