St. Martin's Griffin Will shortz presents super sudoku: 100 new brain-twisting puzzles, paperback/will shortz

Super Sudoku takes America's favorite logic puzzle to the next level In each Super Sudoku puzzle solvers need to complete the grid so that each row, column, 3 x 3 box, AND shaded 3 x 3 box contains the numbers 1 through 9.

It's a clever spin on sudoku that adds an extra level of difficulty that's sure to thrill sudoku fans This collection, edited by the incomparable Will Shortz, contains 100 Super Sudoku puzzles ranging in difficulty from easy to extra hard.