3. How about extra hints and individual __s, to nudge players toward filling out the word list? https://imgur.com/a/VAZhG0Z The "D" and "N" on the right would hopefully clarify the proper orientation of words. (I specifically want the message spelled out via a two-column list because the canonical leftovers are, e.g. "reviled" (r7) not "deliver" (d7), as shown by the bottom-right corners.)
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You still left the last slot in the list starting with A, though. As I already tried to explain, "the last message (which is the same as the puzzle 12 solution) is shown starting with A, and that's also the direction it's read, which breaks the pattern of messages on the right side needing to be read backwards." So replace the A with an N, or put the A at the end. The last clue on the bottom-left (under the smudge) also needs to start with 'a', not 'n', as the clues correspond to how the terms are read, aren't they? Or am I misunderstanding something?
Personally, I would only see those nudges as helping to confirm what to search for in the last puzzle. They wouldn't make me any more inclined to write everything out in the columns. And even if I did write them out, there's no guarantee that I'd realize they're meant to all be read in sequence. I still feel my previous suggestion is the best way to ensure players reach the intended ending. But that's just my opinion.
Regarding the orientation of the final "word" (n15), here's how my logic for how it works:
The trick with Puzzle 12 is that its 12 "words" don't need to actually be words, they just have to be the leftovers.
All leftovers are read top-to-bottom, so the canonical leftovers include nonsense like "foecarton" (f8), "reviled" (r7), and "nowevahwonuoysa" (n15). The leftovers are not the reversed versions like "deliver" (hence no "d7" clue). You can confirm this via the bottom-right hints, and also the bottom-left hints of puzzle 12. So for consistency, the bottom of page 12 must say "n15" just like it says "f8". *
The reason I did it this way is so that when the leftovers ( "reviled", "foecarton", "nowevahwonuoysa", etc.) get written backwards on the right side, the result is a perfectly-readable left-to-right message that's hard to miss.
Hope that makes sense!
*unless I changed the bottom of 12 to have hints like "n8" for "notraceof".
I think I finally get it. The reason it didn't click for me is that thus far, terms on the right column seemed to follow a rule that they always had to form a valid word or phrase when read from right to left. "nowevahwonuoysa" would be the only one not to follow that rule. Actually, more than that, it breaks the bigger, more important rule of these "word searches" always involving searches of actual words, not simply nonsensical letters, so long as you see right-column terms as simply being reversed.
I didn't notice that the puzzle 12 hints were all the same as the bottom-right corner hints, even for ones that go in the right column, which would indeed necessitate writing them backwards. I think I would in fact find it more intuitive if you instead switched up the puzzle 12 hints for the right-column terms as you say ("n8" for "notraceof"), so that they would get written the same as on the previous pages, and this would allow the final term to also follow the pattern of being valid when read backwards from how it's written. Then you could do one last page after where everything gets written out properly, with the right-column terms only reversed there for the final message.
I can see what you were going for, with the elegance of having the final puzzle also serve as the final message all at once, and maybe this isn't an issue most people would be confused by like I was. But speaking for myself at least, it almost made me miss the final message entirely, and I think my suggested approach would help ensure that people understand exactly what you want them to see at the end.