I am the author of a software that lets users create crosswords. Part of that is testing whether a certain letter should be enabled for usage in a certain language.
For portuguese, this poses the question about the use of diacritics. Should any letters incorporating them show up in crosswords (Ç, Ã, ...)? I am not asking about the way Scrabble does it. Its policy on using non-standard letters is specific to their awarding of points and does not apply to my software.
Instead, if one encountered a crossword, let's say in a newspaper, would there be any letters allowed that are not part of the standard latin alphabet? Or, to rephrase that question, if a crossword held the words "informações" and "cruzados", would someone trying to solve it expect that the words could cross at the c/ç, or would they be distinct letters that never fit?
Are there other letters with diacritics that would be considered distinct in that sense? (I think all other cases are accents/tildes above vowels?)