Joz the quiet whistler was the first to imply that it was impossible to solve and actually hinted to you and others that it was impossible 

we supposed to have figured out what the hints supposed to be and read minds now are we?

so if you knew there was no solution, why post the question? i answered the question in text - straight , no fantasies

the evidence is there, and you deny me my win?

Joz, It was not meant to be a competition and you are a winner, more so than the ones who only put effort into Google.

I have no doubt that the ones who quietly whistled away had put effort int that problem as well in the past.

i see youve put ticks on who you thought solved the question

 i'll leave you in your little fantasy

According to Pods diagram and instructions..... it has been solved....

Ok. Where's question 21?

From you...not bkwesbkjsb

and pod, if you thought the first 2 posts answered your question and were as clear as mud, why didnt you tick 'em yesterday, eh?

Best thread ever 

The puzzle is to draw a continuous line which passes only once through each line in the figure.

as I said, I've been puzzled for years by this and then this morning when having a cup of coffee, I actually worked out how to do it; no googling invloved. it is possible. 🙂

i'm thrilled for you,  this must be amother fanasty thread eh?

I detect a hint of coolness?

anyway, I'm pleased I worked it out. I didn't google or click on above links etc. personal satisfaction. 🙂