Just when you thought it was safe to pick up a pencil Killer Su Doku is based on the original Su Doku grid, with the same rules and numbers—1 to 9—but with

Killer Su Doku poses an even greater challenge than the Fiendish Su Doku puzzles.Here are 100 previously unpublished puzzles for hard-core Su Doku addicts.

Specially compiled to provide the most deadly Su Doku challenge, this is the only volume for Su Doku enthusiasts who need a puzzle that really tests their mettl

Perfect for coffee breaks, commutes or relaxing at home, this bumper collection of 300 brand new ultimate killer sudoku puzzles is guaranteed to provide you wit

From krazydad, constructor of the wildly popular and addictive puzzles published in The New York Times as Two Not Touch, here are 360 of your favorite Star Batt