@wallhackio Sure :)
@wallhackio Hey I'm in this!!
If you want to see our puzzles they're at https://hollymcfarland.com/crosswords :)
@amy whao :o
@aescling @wallhackio A letter that's only used in one word
@amy @wallhackio ah
@aescling @wallhackio (So named because if you're unsure about it, you can't "check" it by getting the word that goes the other way)
@wallhackio Yeah, they're like
You will see them occasionally but they have to be pretty strongly justified. Either a theme that uses it somehow (e.g. the NYT crossword from March 6, 2022 https://nyxcrossword.com/2022/03/0306-22-ny-times-crossword-6-mar-22-sunday.html) or grid art. You'll generally see them used only with very easy clues or in a way that allows you to check your work some other way, without a crossing answer (e.g. if there's an unchecked square in a word that's a palindrome, you can mention that in the clue, or do what the linked NYT puzzle did and have a word made out of the unchecked squares together, etc etc)
In cryptics (UK-style puzzles) unchecked squares are completely normal, but that's because the clues work completely differently; every clue provides two ways to get to the answer, so they're effectively "self-checking" :)
@wallhackio @amy what is an unchecked square