Reply To: The official Challenge 10 tips and hints thread
Back in October, when the slip of paper was released, I checked, and yes, it is an invertible matrix.
That makes it useful as a 3×3 Hill key. You may do as you wish with this information. But if it leads
nowhere, don’t get mad at me.
[How could we ever get mad at you? Harry
PS: Oh, I see. Yes, that could make us a bit mad. OK.]