Sudoku: Play SUDOKU great for memory training

240 HARD puzzles for SUDOKULarge characters4 puzzles per page60 pages of sudoku exercises plus 60 pages of solutions (total: 120 pages)Size 6 inch x 9 InchSUDOKU puzzles are known to reduce anxiety, Great for memory training, great fun and easy to learnEven if you have absolutely no math skills.HOW TO DO?Simply enter the numbers 1 to 9 once in each row, column and box to solve each sudoku