I love crostics, and I deeply appreciate the way filling in a square in either the clues or the quote automatically fills in the corresponding square in the other. Ive bought most of the books available, and an enjoying them all at their differing difficulty levels.
There are a couple of improvements Id love to see: First, Id love to have the ability to choose to skip over already filled squares in both clues and quotes. Second, Id really love to have a space (perhaps one that could be toggled in and out of view?) that shows the first letters of the clue answers. On paper, I can sometimes get useful hints to clue answers by recognizing names or titles thus spelled out, but on my iPhone I absolutely can never see more than three of those letters at a time, which really doesnt work!