The Telegraph’s sudoku collections are the most extensive you can buy. This second book of original puzzles is compiled with both addicts and novices in mind: each sudoku is graded according to its level of difficulty, from 'gentle’ through 'moderate’ and 'tough’ to 'diabolical’. All solvers will find Michael Mepham’s introductory tutorial an invaluable guide, and solutions are included at the back of the book.

‘It’s the latest craze in games but there isn’t a computer graphic in sight . . . Addicts are as obsessed as 1980s teenagers fixated on the Rubik’s Cube’ BBC News

‘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