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

Warning: Not suitable for amateur puzzlers! Prepare yourself for the toughest Su Doku challenge there is. These diabolically difficult Ultimate Killer Su Doku p

This addition to the successful Times Killer Su Doku series adds the challenge of arithmetic, taking Su Doku to a new and even deadlier level of difficulty. The

Indexes the Times, Sunday times and magazine, Times literary supplement, Times educational supplement, Times educational supplement Scotland, and the Times high

The Rough Guide Book of Brain Training contains 100 days' worth of puzzles designed to give your brain a thorough work-out. Just 5 puzzles a day will lead to a