Armos Knights (Eastern Palace) — Pick off the six statues with the Bow, about three arrows each. The last survivor turns red and lunges to stomp you.
Lanmolas (Desert Palace) — Three sandworms burst from the floor. Hit each exposed head with arrows, bombs, or the sword.
Moldorm (Tower of Hera) — Strike the tail only. He tries to bump you off the ledge, and a fall restarts the fight.
Agahnim (Castle Tower) — Play "tennis": reflect his energy orbs back with the Master Sword (the Bug-Catching Net also works). Don't reflect the ice spell.
Helmasaur King (Palace of Darkness) — Shatter its mask with the Magic Hammer or bombs, then hit the forehead crystal with sword or arrows.
Arrghus (Swamp Palace) — Pull the orbiting Arrghi off with the Hookshot, clear them, then slash the exposed core.
Mothula (Skull Woods) — The Fire Rod hurts it fast. Dodge the beams, the moving floor, and the spikes.
Blind the Thief (Thieves' Town) — Expose him to sunlight to force his true form, then cut the head. Detached heads float and fire beams.
Kholdstare (Ice Palace) — Melt the ice shell with the Fire Rod (or one Bombos Medallion), then strike the three cores.
Vitreous (Misery Mire) — Shoot the large central eye with the Bow while dodging the smaller eyes that launch at you.
Trinexx (Turtle Rock) — Freeze the fire head with the Ice Rod and burn the ice head with the Fire Rod, then sword them. Finish by striking the flashing body.
Agahnim II (Ganon's Tower) — The tennis match again, now with shadow clones. Reflect the real orb.
Ganon (Pyramid of Power) — Land sword hits, then when he douses the torches relight them with the Lamp or Fire Rod, hit him to turn him blue, and strike with a Silver Arrow.