Sudoku 16x16 Volume 1: Sudoku Xtra Specials
Dr Gareth Moore is the author of a wide range of brain-training and puzzle books for both children and adults, including Keep Your Brain Fit: 101 Ways to Tone your Mind, The Mammoth Book of Brain Workouts and The Rough Guide Book of Brain Training. He also writes the monthly magazine Sudoku Xtra and runs the puzzle website www.puzzlemix.com.