Mensa's Most Difficult Maths Tests provides an exceptional challenge for even the most adept of puzzlers.

This full-colour book features a huge variety of numerical brainteasers that will test even the most mathematical of minds. With puzzles ranging from the familiar – such as kakuro and killer sudoku - to the exotic – such as sum skyscraper and calcudoku – this fiendish puzzle book will keep you entertained for hours. Are you up to the challenge?

Dr Gareth Moore is the author of over 250 bestselling international puzzle and brain-training titles from a wide range of publishers. His books are available in over 40 countries, with worldwide sales of over 5 million copies. His puzzles also appear in magazines and newspapers, and can be played online at the PuzzleMix website. He is also the creator of Brained Up, a cutting-edge brain training site that offers daily sessions to help you make the most of your brain, and is a director of the UK Puzzle Association as well as a former board member of the World Puzzle Federation. He works with a co-writer, Laura Jayne Ayres, on his murder mystery-themed puzzle books.