🧩 Puzzles found or solved in the Mind Games box set book (Spoilers)

[Good Dog Nigel]

So... tell us, what have you found? Do you need any clues?
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[Mariana Fraga]

I still have no idea what I'm supposed to do with the letters that appear under ultraviolet light on the I-Ching diary page. I thought at first that it had something to do with the Nutopia puzzle, but then realized that it didn't.