500 Sudoku Anti-Knight Puzzles Very Hard

500 excellent puzzles at the level of Very Hard. All riddles have only 1 solution. 6 puzzles per page. The font size is correct, you will not have to strain your eyes when solving puzzles. High quality paper and print (all puzzles read well, easy to write with pen and pencil without worry of bleed-through). The goal of Anti-Knight Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once and all cells at a chess knight move (at a distance of 2 by 1) must hold different numbers.