The Times: Holiday Su Doku 2: 200 Killer Su Doku puzzles

The Times Killer Su Doku is dangerously addictive. Here is a collection of 200 of the best Times Killer Su Doku puzzles to wrangle with over the holiday season.

Fans of Su Doku have an ever increasing desire for trickier puzzles and Killer Su Doku should satiate their appetites as it poses an even greater challenge than the Fiendish Su Doku puzzles. It takes the number placing puzzle to the next level by adding an element of arithmeti...