Killer Sudoku: More than 200 of the most difficult puzzles

Author: Dr. Gareth Moore

Publisher: Welbeck

Paperback: 288

Test your powers of deduction against more than 200 devilishly difficult Killer Sudoku puzzles.

Famous puzzle-setter Gareth Moore has put together a supreme test of logic. These brand-new puzzles will provide hours of entertainment for anyone who enjoys a difficult mental challenge.