I'm about halfway through this puzzle in which a "letter must be dropped wherever it occurs" in all the down answers, these then spell out a couple of phrases.
The problem, as I see it, is that some of the the candidates for dropped letters are in unchecked cells, so there's no way to work out from the across clues which ones to omit. such as in 12d and 21d.
Does this mean we're supposed to deduce some of the omitted letters from the message itself by guessing words in the phrases, and some from the clues?
Or, more likely, I have misundertood it?