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 sold in 35 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 comic artist from Torquay. As well as writing and drawing for The Phoenix, she also writes for The Beano and illustrates a variety of children's books. She has created puzzle and activity and comic books for various publishers, including contributing to Usborne's bestselling Write and Draw Your Own Comics. Her work for Buster Books includes the Bright Sparks series, I Heart Cute Colouring and the laugh-out-loud A Day in the Life of a Poo, a Gnu and You.