'
"A crossword puzzle is a word game that involves filling a rectangular or square grid with interconnected words,
based on given definitions or clues; the grid is divided into many white boxes: each word must be inserted inside the grid so that it intersects with at least one
letter of a word already present.
Words are usually written horizontally (left to right) or vertically (top to bottom); the white boxes are numbered and correspond to definitions
or clues that indicate the word to insert."