This glitch is useful, because the famous screenwarp glitch is fixed in the DX version. First, kill 4 enemies on the overworld (Mysterious Woods is the closest), then go to Mabe Village. Walk behind BowWow's kennel, stand behind the top right corner of it and walk in to it and hold Down + Left. If successful, you will enter a glitched world, otherwise try again. In glitched world, you can find treasure from much later in the game like the Magic Rod. Refer to the Underworld Treasure Guide FAQ for further information.