A riddle is not a physical thing but okay, let's say you want to destroy an instance of a riddle that is in a book: how do you know it's in that book without looking, and therefore copying the riddle into your own mind? This is known as the Pink Streisand Paradox.
You can solve a puzzle, but what would "eliminating" a puzzle even mean?
If you know the solution, it's no longer a puzzle.
Soak it in nitric and sulfuric acid, let it dry, then light it on fire?
A riddle is not a physical thing but okay, let's say you want to destroy an instance of a riddle that is in a book: how do you know it's in that book without looking, and therefore copying the riddle into your own mind? This is known as the Pink Streisand Paradox.
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comprehensive.