'On no account should any reader, not already hooked, so much as glance at a Sudoku. That way lies addiction and madness. Sudokus are to the first decade of the 21st century what Rubik's Cube was to the 1970s. They are an obssession that divides the population' Tom Utley, Daily Telegraph

Sudoku is a hybrid: its name derives from Japanese (loosely translated it means 'number in an allotted place') and its form can be traced back to the magic squares invented in 18th century Switzerland. The result is a numerical brainteaser that is fiendish, compulsive, and, in the simplicity of its rules, 'sublimely beautiful'. This collection, which ranges in difficulty from the gentle through the tough to the diabolical, is the most extensive on the market.

'Sudoku is dangerous stuff. Forget work and family -- think papers hurled across the room and industrial-sized blobs of correction fluid. I love it!' The Times