Obtain ten medals in the Four Swords multiplayer mode, and you can start a riddle quest with the Lumberjack in Link to the Past. Complete the Riddle Quest to obtain the Hurricane Blade special move.
When you are in the light world, go to the dungeon where you get the Ice Rod. To the left, you will see a little fish flopping around. If you catch it with the right button, you can go up one screen and throw it into the water. It will thank you with 20 ruppees.
It is indeed possible to swim anywhere in Hyrule. Call the flute bird and go to warp point 4 (your house). Go down one screen and kill all the monsters. Face the pool of water to your left, and call the flute again. Immidiately pegasus boot into the water. After you automatically stop at the water's edge, the flute bird will pick you up. Cancel the flight and when it sets you down you will still be on land --- but swimming! You can freely visit anywhere in Hyrule, but if you get injured or jump off a ledge you lose this ability. You also cannot access any items. Have fun!
The Chickens found in Kakariko Village and other areas have a vendetta against you; that is, of course, if you attack them. Hit a chicken enough with your various weapons, whether it be sword, arrow, bomb, whatever, and the chickens will come from all directions to peck you!
In order to unlock this level, you must beat both A Link to the Past and The Four Swords. Then get 20 Rupees, and go into the hole in the Pyramid of Power. Give the creature 20 Rupees, and he will dissapear, allowing you to pass. Beat this level to get a neat secret ending.
Unlockables using Four Swords.
In most areas of the game this glitch is possible. It allows Link to walk through walls, but in some areas the game, will glitch, and Link will be "frozen", or, unable to move in any direction at all. All you need are the Pegasus Boots and the Magic Mirror. One example is in the East Palace. Once you enter, pick up the pot and throw it. Then step on the switch. The door in front of Link should open. Go through the door, step on the switch, and dash threw the enemies through the next door. Then attempt to jump off the ledge to the left. But as Link's jumping off, before he's in mid-air and as soon as he makes the "hup" sound when leaping off, use the Magic Mirror to make Link appear back at the dungeon's entrance. Then repeat the first two steps untill you're back in the room with the ledge. If you've done the glitch correctly so far, when you dash into the statue on the right, Link should turn invisible when he lands back on the ground. This make take a few tries. NOTE: When Link attempts to walk out of the walls, he will jump back on to normal ground again and the glitch will have to be redone.
Call up the Flute Duck and fly to point 7 on the map, which is the light world watergate. go up one screen to the place where the water portal is. now go up to the top right corner of the screen in the shallow water. call the flute duck again but this time before it comes aim a correctly timed pegasus charge at your left side. if you time it right, the duck will pick you up when your sword is sticking out while you're dashing. When you enter the map screen, press B to cancel and the duck will put you back down on the ground. Here you will start walking funny and when you touch a solid surface, you will bounce off of it. now go up to the right-most green totem statue so you're facing up. walk into it and bounce off into the deep water. (if you just go directly into the water the trick won't work) Swim towards the water portal and get transported to that place east of the graveyard. If done correctly, you should be standing on the water instead of swimming. Here you can walk around any screen you like and still be walking, but do NOT jump onto one of those green platforms or the trick will stop immediately. And also, it is okay to use the Pegasus Boots, but if you crash into something, you will start swimming again. and if you call up the Flute Duck and press B to cancel the map selection, you'll be swimming.