Fifth Boss: Agahnim: Hyrule Castle
Don't panic, he is not the final boss of the game,

just the light world. After the little scene where

he made Zelda disappear, just cut the curtains behind

to reveal the boss room. Frankly he isn't that

hard, all you do is reflect his yellow beams.

Unfortunately he also has those blue beams, which can

be avoided and run for your life when he uses lightning.