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A collection of 200 previously unpublished Fiendish Su Doku puzzles. Perfect for the expert solver in need of a constant supply of ultra-difficult puzzles. Guaranteed to provide hours of absorbing, brain-stretching entertainment.

A collection of 200 Difficult Su Doku puzzles. Perfect for the more advanced Su Doku solver in need of a constant supply of challenging puzzles. Guaranteed to provide hours of absorbing, brain-stretching entertainment.

Beware: The Times Killer Su Doku gets about as close as possible to the label 'unputdownable'. In Book 2, the challenge continues with the emphasis on the tougher and more deadly puzzles. Prepare to be rattled.