Sudoku Xtra 23: The Logic Puzzle Brain Workout
Dr Gareth Moore is the author of a wide range of brain-training and puzzle books for both children and adults, including The Mammoth Book of New Sudoku, The Mammoth Book of Fun Brain Training, The Rough Guide Book of Brain Training, Keep Your Brain Fit: 101 Ways to Tone your Mind, and The Mammoth Book of Brain Workouts. He also writes the monthly magazine Sudoku Xtra and runs the puzzle website www.puzzlemix.com. Find a range of his books at www.puzzlebooks.org.