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?