The Biggoron Sword is an optional high-damage two-handed weapon only usable by adult Link. This weapon is the final reward of a long trading questline that will have you delivering items all around the world of the game.
It is recommended to follow this guide after completing the Water Temple, as doing so enables faster and easier routes. Continue reading to learn how to complete this questline and get your hands on the Biggoron Sword.
Step #1: Kakariko Village - Adult Link
Talk to the Cucco Lady to borrow the Pocket Cucco egg and play the Sun's Song until the egg hatches.
Step #2: Kakariko Village - Adult Link
Wake up Talon with the Pocket Cucco in the house by the village entrance, then return to the Cucco Lady and trade the Pocket Cucco for Cojiro.
Step #3: Lost Woods to Kakariko Village - Adult Link
Give Cojiro to the Master Craftsman's Son in the Lost Woods to get the Odd Mushroom. You can find him by going left in the Lost Woods from the Kokiri Forest entrance.
Once you get the Odd Mushroom, you'll have a timer of 4 minutes to bring it to Granny in Kakariko Village. Using warp songs will cancel the timer and fail the quest, so you need to do this on foot.
The fastest route is to head back to the entrance you came through, continue straight ahead, turn left, and continue straight to reach Goron City. Exit Goron City and head down Death Mountain Trail to reach Kakariko Village. Enter the potion shop just to your left and exit through the back door to reach the building across the way, then give the Odd Mushroom to Granny to receive an Odd Poultice.
Step #4: Lost Woods - Adult Link
Return to where the Master Craftsman's Son was in the Lost Woods and you'll find Fado instead (there's no timer this time, so take your time). Give the Odd Poultice to Fado and she'll give you the Poacher's Saw.
Step #5: Gerudo Valley - Adult Link
Give the Poacher's Saw to the Master Craftsman by the tent to receive the Broken Goron Sword.
Step #6: Death Mountain Trail - Adult Link
Get to the top of Death Mountain Trail and show the Broken Goron Sword to Biggoron to receive a Prescription for King Zora.
Step #7: Zora Domain to Lake Hylia - Adult Link
Go to Zora Domain and show the Prescription to King Zora to receive the Eyeball Frog. Once you do this, you'll have a timer of 2:30 to bring it to the scientist at Lake Hylia. Again, warp songs are not allowed.
Melting King Zora's Red Ice
If you haven't finished the Water Temple yet, you'll need to melt the red ice on King Zora by using a Blue Flame. You can find Blue Flames inside the Ice Cavern dungeon, located in the area right behind King Zora: the Zora Fountain.
You'll need to use an Empty Bottle to store the flame and then release it next to King Zora to melt the red ice.
You'll need to use an Empty Bottle to store the flame and then release it next to King Zora to melt the red ice.
Once you get the Eyeball Frog, drop into the pool at the bottom of Zora Domain and dive to the exit to emerge at Lake Hylia. From there, enter the building to the northwest and give the Eyeball Frog to the Lake Scientist to receive the Specialty Eye Drops.
Step #8: Lake Hylia to Death Mountain Trail - Adult Link
Once again, you'll have a timer of 3 minutes to bring the Specialty Eye Drops to Biggoron. The fastest route is to dive back to Zora Domain and exit to Zora River. From there, go down the stairs to the left and dive to the exit to emerge in the Lost Woods. Exit the water and go straight, then right to enter Goron City. Exit Goron City and make your way to the top of Death Mountain Trail, then give the Specialty Eye Drops to Biggoron and he'll give you a receipt for the Biggoron Sword.
Step #9: Death Mountain Trail - Adult Link
Finally, wait 3 in-game days and give the receipt to Biggoron to obtain the Biggoron Sword! You can play the Sun's Song several times to make time pass faster. This marks the end of the item trading quest.
