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in hyrule castle
there isn't one...
My opinion is ganondorf's first phase puppet princess Zelda
The last level on Zelda twilight princess is hyrule castle where you face the final boss ganondorf.
It's on the map.
beat the boss
deffet the monkey mini boss
Argorok the Dragon
The mirror of twilight is in the desert. you gain access through the mirror of twilight after defeating the boss of the desert temple.
no. It is pathetically easy
Find the big key.
in the main room