Thanks! Basically, I think, if there were no hints about the key, it's impossible to solve it. Any numbers or letters of any length may be the key!
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Thanks! Basically, I think, if there were no hints about the key, it's impossible to solve it. Any numbers or letters of any length may be the key!
Most of the time this kind of key is directly related to the puzzle. In that case you did not have to look very far. I have joined puzzles far more difficult than this one.
I don't know if you know this one that remains unsolved: https://www.xixoio.com/cryptopuzzle