Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles MTO DOVER_APR58 professionally arranged in the original

professionally arranged in the original easy-to-read Real Book notation

While the title of the book implies 'mandalas' which are normally circular or perfect square

making it an excellent choice for seniors and adults alike

distilled down to an uncomplicated form

Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles MTO DOVER_APR58 professionally arranged in the originalWatch out! These puzzles are for the most extreme solvers! But if you dare, grab a pen and take on these two hundred all new extra challenging puzzles in Will Shortz Presents Black Diamond Sudoku. Features: 200 hard puzzles Big grids for easy solving Introduction by legendary puzzlemaster Will Shortz