Sudoku is the martial art of puzzles. This book presents a collection of energetic enigmas and numerical conundrums. It is suitable for solvers on the go and fo

Bring a new skill to the fighting repertoire: interaction.

Puzzles for the masters, featuring an array of Gordonian Rectangles.

Swordfish, the Gordonian Polygon, Alternating Digits, and Jellyfish make these sudoku super-hard!

Puzzlesmiths of all skill levels will find original logic puzzles that will flex the brain, challenge assumptions, and entertain for hours. In addition to offer