There are two types of people in the world today: those hooked on Sudoku, and those about to be. Sudoku is a mind-bending, pleasantly addictive number-placement game that exercises your brain and helps you escape from the everyday stresses of life. Puzzles are organised into four levels: from the Painless (best to start here or play these when you're not feeling like Einstein), to the Tricky (so you think you can play Sudoku?), then on to the Nasty (come on then, try me!), and finally to those of Migraine - inducing difficulty (number crunching for the addict).
Pete Sinden is a bestselling author and has a black belt in Sudoku.