am everywhere, but I am not visible,

Without me, there is no need to answer.

I can be complex, I can be simple,

But now I am left with only emptiness.

Everyone is waiting for my challenge and move,

To give the mind the right path.

They are looking for me in every word…

What is this?

(Answer: Riddle / Task / Question that you forgot to write!)

If you had some other specific topic in mind – just write it or send the text of the most difficult riddle!