How many puzzles per page?

1, 2, 4 or 6 for classic 9 x 9, Sudoku X, jigsaw, 6 x 6, 4 x 4 and kids books. Up to 2 for killer, thermo and arrow (their totals and lines need room). Always 1 for samurai and 16 x 16. The fewer per page, the bigger the grid and the more room for pencil marks.