How many solutions per page?
4, 6 or 9 per page (samurai and 16 x 16: 2 or 4). 4 is better for large print books. Each solution shows its puzzle number and the page of the puzzle, the givens in bold and the filled numbers lighter. KDP needs digits of 7 pt or more; if the solutions get smaller, the "Ready to publish" card says "The solutions' digits are X pt: KDP needs 7 pt or more. Choose fewer solutions per page."