About the puzzles
Who are they for? Are they for kids?
Mostly they are for puzzlers with a grown-up vocabulary, like the crosswords in the newspapers. There is a very occasional 'adult concept' or curse word.
There are a few for younger puzzlers too, including the Cryptic Puzzles for Kids booklet, which introduces cryptic crosswords with a simplified clue format and vocabulary.
How hard are they?
This will depend on the solver's experience, however they aren't intended to be fiendishly difficult.
How are they made?
Simply! With one exception, everything is made with paper/card (mostly recycled) and string (cotton, bamboo, or hemp). When you are finished, you can remove the string and reuse or recycle the paper/card. The exception is the Cryptics for Kids booklet, which is staple-bound. All printing is done locally.