Are you sharp enough to solve these devious mind-bogglers? These diverting number, geometric, logic, analytical, and story problems--which vary in difficulty fr

More stimulating mathematics puzzles from bestselling author Paul Nahin How do technicians repair broken communications cables at the bottom of the ocean withou

Stun your school friends and amaze your parents with your awesome brainpower as you work your way through these mind-twisting challenges. Packed with tricky mat

These 99 number-crunching puzzles are sudoku PLUS! Just like the familiar sudoku that solvers love, the grids go from 1 to 9, and each number appears only once

Population Explosion and Other Mathematical Puzzles is a wonderful addition to Dr Dick Hess's previous successful books, Mental Gymnastics: Recreational Mathema