Upon reaching the end of the Stone Tower Temple, Link finds himself in a sandy expanse, and he is welcomed by the roar of a mighty monster. Make that two monsters, for it’s none other than the giant masked insect, Twinmold!
Twinmold is actually two bosses in one: two giant, flying centipedes that emerge from the surrounding sands. Each Twinmold flies through the sky for a time and then dives back into the dunes. Aim manually at the blue Twinmold first (don’t use 
-Targeting), and shoot regular arrows at the big yellow eyes on its underbelly as it flies through the air.
Once you put out all of the blue Twinmold’s big yellow eyes, the monster collapses to the ground. Now’s your chance! The blue Twinmold’s main eyeball pops out, and the monster slinks around helplessly in a circle. Shoot its weak point repeatedly with Light Arrows to inflict maximum damage while you have the chance.
If the blue Twinmold survives and recovers, resume shooting out its big yellow eyes with arrows to knock it back down. Punish the weak spot each time until you at last manage to slay the blue Twinmold.
Giant Might
After the blue Twinmold falls, a chest suddenly appears on the arena’s central platform. Hurry over and open it to claim the Giant’s Mask.
Smash the platform’s big green jars for Magic Jars if you need magic power, then put on the Giant’s Mask. Link transforms into a massive warrior, gaining the strength he needs to take on the red Twinmold.
The Giant’s Mask lets you batter the red Twinmold with devastating blows. Unleash a barrage of punches at the red Twinmold each time it passes by, sidestepping its fireballs and striking the boss from the side as it flies past.
Keep battering the red Twinmold with Giant Link’s heavy blows until the monster finally collapses. Take that, Twinmold! Hurry over to its tail, and notice that you can grab it.
Press 
and grab the red Twinmold’s tail before it recovers, and Giant Link takes the monster for a spin. The move inflicts great damage, but the red Twinmold doesn’t go down without a fight. You’ll need to stun it and swing it by its tail four times to win the battle.