Biggoron's Sword

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First, go to Kakariko Village and talk to the lady behind Impa's house(the one that gives you the bottle as a kid for finding all of her Cuccos.) Talk to her and she will give you an egg.
Play the Sun's Song two times so that a day will pass, and a Pocket Cucco will hatch.
Take it into the house somewhat near the entrance to the village, where you will find Talon asleep. Use the Pocket Cucco on him to wake him up.
Now, go back to the lady and show her the Pocket Cucco. She will take it back and offer you Cojiro. Of course you want to take it!
Now, with the Cojiro, go to the Lost Woods in the Kokiri Forest. As soon as you walk in, take a left and you will find the lady's brother. Show him Cojiro and he will give you the mushroom.
Now you have to hurry or the mushroom will spoil and you'll have to try again! Head to Kakariko Village. Make sure it's daytime and head to the potion shop near the entrance to Death Mountain. Leave through the door on the left and enter the next house. Give the mushroom to the old lady and she will give you the Odd Potion.
Now take the odd potion back to the spot where the Pocket Cucco lady's brother was. There will be a Kokiri girl in his place. Give her the odd potion and take the Poacher's Saw.
Now, leave to the Hyrule Field and summon Epona with Epona's Song. Ride her to Gerudo Valley. Once you're there, speed up and jump over the gap between the two broken parts of the bridge. On the other side, give the Saw to the man there and he will give you the broken Goron's Sword.
Take the broken Goron's Sword to the top of Death Mountain and show it to Biggoron, who is at the very top of Death Mountain near the entrance to Death Mountain Crater/Great Fairy's Cave. He will give you the prescription.
Take the prescription to King Zora in Zora's domain (you must have unfroze him with blue fire, which you can get in a store or from the Ice Cavern) and show it to him. He will give you the Eyeball Frog.
Now, quickly leave Zora's River and ride Epona to the laboratory at Lake Hylia. Remember, DO NOT WARP, or it will spoil automatically. Show the old man the Eyeball Frog and after finding out that it's for eyedrops, not dinner, he'll give you the Eyedrops.
Quickly take the Eyedrops back to Biggoron on the top of Death Mountain(remember, don't warp!) Give them to him and he will give you the Claim Check.
Now play the Sun's Song several times and revisit him. If he says he's finished give him the Claim Check and he'll give you Biggoron's Sword!
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