Sudoku 18x18 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 The Mammoth Book of Fun Brain Training, Keep Your Brain Fit: 101 Ways to Tone your Mind and The Rough Guide Book of Brain Training. He also writes the monthly magazine Sudoku Xtra (www.sudokuxtra.com) and runs the puzzle website www.puzzlemix.com.