Dr Gareth Moore is the author of over 50 puzzle and brain-training books for both children and adults, including The Mammoth Book of Brain Games, The Mammoth Book of New Sudoku and The Mammoth Book of Fun Brain Training. His puzzles also appear in a range of newspapers and magazines, and he frequently features in the media as a puzzle expert. He is also the creator of the daily brain-training website BrainedUp.com and runs popular puzzle site PuzzleMix.com.