WHAT'S THE CODE FOR THE KEYPAD IN THE SECRET ROOM?
Notice the symbol next to the keypad.
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You will find something very much like it somewhere else in the castle.
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Go to the parlor.
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Do you see the cards on the table, where previously there was a chessboard? If not, no worries, they'll appear after you've completed everything else you need to do first. Come back when they're there.
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One set forms the same crown symbol as on the keypad. The other set seems like it's telling you something.
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K, A, 7, 3.
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Only, the numbers are upside down.
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If you'd read them as letters, they'd spell …
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KALE.
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That's still not the code, though.
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And there's no kale in the pantry.
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You will find a further clue in the library.
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Look at the vase with the Graces again.
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The code is BEAUTY. This opens the spying hole.