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

200 Killer Sudoku puzzles for intermediate level puzzlers. These puzzlers bridge the gap between Killer Sudoku for Beginners by Robert Macmillan and Killer Sudo

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

Have you already mastered traditional Sudoku and are ready for a new challenge? Welcome to Killer Sudoku! The ultimate puzzle that will truly test your skills.

Killer Sudoku (also called Sum Sudoku) are a kind of hybrid puzzle that combine the best features of Sudoku and Kakuro (cross-sum) puzzles. Like a regular Sudok