Sudoku Collection: 200 Very Hard Anti-Knight Sudoku Puzzles 9x9 (Paperback) by Alena Gurin

9781689155991. New condition. Trade paperback. Language: English. Pages: 122. Trade paperback (US). Glued binding. 122 p. Anti-Knight Sudoku, 36. 200 excellent puzzles 9x9 at the level of Very Hard. Perfect for Advanced players. All riddles have only 1 solution. 2 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.