Sudoku no longer a challenge? Then add a Killer twist Place 1 to 9 into each of the rows, columns and boxes, whilst obeying the dashed-line shape totals. It's as easy as 1 + 2 + 3. This book features 100 top-quality puzzles from Dr Gareth Moore, author of over 20 best selling international puzzle and brain-training titles from a wide range of publishers.