Unbreakable Giants Sword (Biggoron's Sword):

When you are adult link go to Kakariko village (note that you must have Epona) and talk to the cuckoo lady she will give you an egg which will hatch of course after it hatches walk around and go into all the houses until you hear a man snoring walk around the house until you see the man asleep use the chicken that the cuckoo lady gave you to wake him up after you have done that go back to the lady and show it to her she will then give you a blue chicken now go to the lost woods when you enter take a left (on Master quest you take a right) and there's a guy leaning on a stump show him the blue chicken and he will give you a mushroom you'll have 3 minutes to get it to the old potion lady in the building with the odd symbol on it not the skull in Kakariko village show it to her and she will make you a potion take back to the exact same place in the lost woods but there is a little elf girl instead and you show it to her and then she will give you a saw and then you have to take it to the Gerudo valley and give it to the man outside the tent and then he will give you a broken giant knife and you take that to death mountain and climb the summit when you get to the top go to the right and there will be a giant Goron and you show him the broken knife and he will need some eye drops so he’ll give you a prescription for it so you take it and show it to king Zora and he’ll give you a frog so then you'll have 3 minutes to take it to lake Hylia and go to the right and go in the lab and show it to the doctor and he’ll give you eye drops so then you must race to death mountain with the eye drops in 4 minutes and the Goron will give you the sword order so you must wait 2 days and then show it to him good luck!