Dr Gareth Moore (B.Sc (Hons) M.Phil Ph.D) is the internationally bestselling author of a wide range of brain-training and puzzle books for both children and adults, including Anti-stress Puzzles, Ultimate Dot to Dot, Brain Games for Clever Kids, Lateral Logic, Extreme Mazes and The Ordinance Survey Puzzle Book. His books have sold over a million copies in the UK alone and have been published in 29 different languages. He is also the creator of online brain-training site BrainedUp.com and runs the daily puzzle site PuzzleMix.com. Jess Bradley is an illustrator and character designer based in Bristol. Jess prefers to hand-draw before digitally colouring her work, and her style is typically cute, colourful and quirky.