Killer Su Doku poses an even greater challenge than the Fiendish Su Doku puzzles.Here are 100 previously unpublished puzzles for hard-core Su Doku addicts.

Puzzlers ready to live dangerously and push beyond their mental comfort zone should steel themselves for the second book in The Times' toughest Killer series ye

The ideal gift for su doku enthusiasts. If you like to live dangerously and push beyond your mental comfort zone, steel yourself for The Times' toughest Ultimat

Millions of Americans have already acclaimed sudoku as the most addictive, enjoyable puzzle since the Rubik's Cube. So don't wait: Pick up a pencil and solve aw

The "New York Times" crossword editor and puzzlemaster takes Sudoku to a whole new level with this collection featuring 100 brand-new (and just as addictive) pu