I'm stuck again! I've been working on the above puzzle on and off for the past week and keep running into dead ends. I think I've tried every possible combination at this stage, but I guess I must be missing something (or worse still, assuming a particular combination must apply for a particular cage or set of cages when in fact there is an alternative that I've overlooked).

I'm not looking for any help or hints, but I would like to know if anyone has managed to solve it and , if so, how difficult did you find it?

I solved it a long time ago and I do not remember how difficult it was, certainly not among the most difficult.
I only need A4V14 that I try and I try again without finding the solution.

Thanks for your reply. I can't understand why it's causing me such difficulty as a lot of the puzzle cab be filled in fairly quickly.

What is the general sense on the difficulty level of the puzzles?

Are most of them maybe too easy?

Patrick

PS: While we're on the subject of AP4, I have a question about a4v16. There's a cage with value 7&. As the puzzle contains the numbers -1 to +7, the only logical combination I can consider is -1, 7. But this suggests that 7 in binary form is (-1)111. But that seems to me to be equivalent to saying the -1 in decimal form equals (-1)999, which I guess is technically true, but would be a highly unusual interpretation. Or am I missing something?

It's taken me 5 days to do the last two puzzles, so at this rate, it will another month before I complete the remaining 12.

I wonder is this a candidate for the most difficult book puzzle ever?

It could be.

So far 2 (TWO) people have solved it ...