Zelda 3 A Link to the Past Walkthrough on Super NES: From the Palace of Darkness to the Second Crystal Palace (GBA, SNES, Super Nintendo)

Go southwest of the palace and jump into the water. Go to the left of the 5th crystal palace (look at the map) and use your magic mirror inside the stone circle (1). Take the 1/4 heart and return to the Dark World using the teleporter. Note that you can hammer down the stakes with the magic hammer. Go to the northeast of the map (where you bought the flippers in the Light World) and throw an object into the stone circle (2): you will obtain the Quake Medallion. Since we are getting a medallion, might as well get them all! Go just to the left of the Tower of Hera (3rd medallion), take the bridge and use the book to obtain the Ether Medallion (3).

Go down below the Bomb Shop (your house in the Light World) and make a hole just to the right (1) to get 300 rupees (there is a hole just above the guy who gives them to you). If you were in the Light World, there is a teleporter just below Link's house, to the left when you change screens. You must hammer a stake and lift the rock. Before entering the 2nd palace, head west to the purple stakes and use your mirror while standing in the middle (2). Go to the left and use the book to obtain the Bombos Medallion. Return to the right, take the teleporter and go in front of the 2nd palace. Before entering, return to the Light World and enter the corresponding structure. Open the floodgate by pulling the lever (3) and return to the Dark World. You can now enter the 2nd crystal palace, the Swamp Palace.

Here is a save file for the ZSNES emulator (to be copied and pasted into the Rom folder).