To obtain the Hookshot,(Is needed to complete game.) you need to travel to the bottom floor of the Wind Temple.

Once there, you must enter the door with the different design then the others.

Once inside the room, a Red Wizzrobe will appear as the Mini-boss.

The Red Wizzrobe can summon Darknuts, Moblins and One Yellow Wizzrobe, along with its triple fireball attack.
(A Yellow Wizrobe can summon fire Keese, and Kargoroks.)

You must fire an arrow at it to damage it, unless it is at ground level, in which you can use your sword.

Also, although the Red Wizzrobe has poor defense against Fire Arrows, but the fastest way to defeat the it is by shooting it with Ice Arrows when it is on the ground, and then picking it up and throwing it or using the Skull Hammer while it is frozen. If done properly, the Red Wizzrobe will die instantly.

All of the other summoned enemies must also be killed, even if the Wizzrobe is dead.

Once done, a Chest will appear, containing the Hookshot.