Nope! A while ago I was making a quiz about word search hidden message and some of them have like gibberish as hidden message (for example #11, #13 and #14).
Others just fill all the grid without leaving spare letters iirc.
#13 does actually, it's just a single letter so nothing more can be done. I've fixed the others. Any more you know of? It looks like many were ones I redid from old dailies into new format back in April 2023. Some I have redone over the years to fix issues but some never got fixed, since I only started doing hidden messages partway through the original dailies run.
Also I believe all Word Searches should have hidden messages, so it's not necessary to add that to the description.
Other than that nice puzzle
I put the bold description because I saw that many other puzzles (even featured ones) don't have hidden messages
Others just fill all the grid without leaving spare letters iirc.
Most of them do have a hidden message though.
Let's do it like this: as I make the quiz and find other word searches with no hidden messages, I'll tell you in the dms