Sidequests

Biggoron’s Sword and other optional rewards

Notable rewards

Bottle with a Cucco

Round up every loose Cucco in Anju's pen before time runs out

Bigger Quiver

Clear a set score threshold in Gerudo's Fortress's Horseback Archery

Rupees from Big Poes

Catch Big Poes on horseback with the Bow and sell them at the Market's Ghost Shop at night

Ice Arrows

Clear the Gerudo Training Ground room by room — silver rupee puzzles, a Hover Boots quicksand room, and a timed enemy gauntlet — for the reward chest at the very end

Double Magic

Play the Song of Storms in front of a hidden Great Fairy near Ganon's Castle

Double Defense

Play the Song of Storms in front of another hidden Great Fairy around Hyrule Castle

Mask of Truth

Return every mask borrowed from the Happy Mask Shop on time — unlocks extra dialogue with certain characters

Golden Scale

As adult Link, land a fish that beats the current record by 4+ lbs (20 lbs or more) at the Lake Hylia Fishing Pond — it lets you dive deeper and longer, useful for a couple of underwater collectibles already on your checklist

Poe Collector's Bottle

Sell 10 Big Poes — caught on horseback with the Bow, sold at the Market's Ghost Shop at night — to the Poe collector; the 10th sale earns a bottle on top of the usual rupees

Bottle of Lon Lon Milk

Talk to Talon inside his house at Lon Lon Ranch as a child and pick the three clucking Super Cuccos out of the flock within 30 seconds — win once for a free bottle, then replay it anytime for a cheap refill

Trading sequence (Biggoron’s Sword)

1

Weird Egg

A gift from the Cucco-keeping woman in Kakariko Village. Carry it around until it hatches into a Pocket Cucco overnight.
2

Pocket Cucco

Use it to wake sleepy Talon (at Lon Lon Ranch or in Kakariko), then bring it back to the Cucco lady.
3

Cojiro

The rare blue Cucco you get in return. It never spoils, so take your time on this step.
4

Odd Mushroom

Trade Cojiro for it with the poacher hiding in the Lost Woods.
5

Odd Potion

Rush it to the old woman at the potion shop within 3 minutes — the mushroom spoils fast.
6

Poacher's Saw

Hand it to the young Kokiri woman lost in the Lost Woods maze.
7

Broken Goron's Sword

The Master Carpenter in Gerudo Valley fixes his mold in exchange for the saw and hands you the broken sword next.
8

Prescription

Climb Death Mountain and give the broken sword to Biggoron; he asks for a prescription in return.
9

Eyeball Frog

Deliver the prescription to King Zora (already freed from the ice); he passes it to the doctor frogs and brings back an eyeball frog.
10

Eyedrops

Rush the frog to the Lake Hylia lab within 3 minutes for the 'world's finest eye drops.'
11

Claim Check

Bring the eyedrops to Biggoron within 4 minutes; he takes 3 in-game days to reforge the sword and hands you a claim check.
12

Biggoron's Sword

Return after those 3 days with the claim check — Biggoron hands over the strongest weapon in the game.