Thanks to King, I could finally clear the Ice Palace in "The Legend of Zelda: A Link to the Past".
But now, I'm having trouble with entering... THE SWAMP OF EVIL.
(1/2 above magic meter, 16 hearts, 15 max bombs, 30 max arrows, LV3 Master Sword, only two items missing between Magic Cape and the bottles.)
It's progress, at least~.
Getting to the Swamp of Evil requires you to obtain the Flute.
Getting the flute requires you to use the Shovel you obtained in the Dark World clearing and return to that area's Light World version. Then you dig up the Flute in the Northwest corner and return to the Dark World to offer it to the Flute Player. He'll let you keep it and you can go to Kakariko Village and play it near the Weathervane, transforming it. After all that, simply return to the Desert of Mystery where you'll be warped near a warp point that takes you to the Swamp of Evil.