Filling the Tube with many a feverish puzzle solver, Su Doku has attracted a startling number of devotees who eagerly begin their commute or leave early for lunch, puzzle in hand. Now, with Alpha Doku, solvers can turn their logic towards letters, satisfying their craving for a brisk, tantalizing mental exercise in a new and captivating way.

Alpha Doku provides 100 puzzles in varying degrees of difficulty, in the same straight-forward, engaging structure of The Times Su Doku Books 1-5 series. However, solvers will work with the letters A-H, instead of the numbers 1-9.

The Su Doku guru, Wayne Gould, has created this new puzzle collection. A figure of second-to-none Su Doku credibility, Gould sparked the craze when he brought the puzzles over from Japan and began setting them for The Times. Now, focusing his powers in a slightly different direction, Gould aims to create another mind-bending habit for puzzle solvers everywhere.

Given a new spin and fresh look, Alpha Doku promises to be both innovative and as challenging and enjoyably addictive as the original.