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(Tripod Sudoku) is a variation of sudoku, where the borders of regions are not defined. The goal is to fill the grid with digits and divide the grid into regions. Each digit appears exactly once in every row, column and region. All points where three lines meet are given. There are no points where four lines meet.
Amigurumi is the making of little crochet characters. Designers from all over the world help you surprise your friends and family with these engaging handmade gifts. The projects in this book cover all skill levels
Co-written by the cube's inventor, this book serves as a comprehensive guide to the Rubik's cube. It opens up a wealth of fascinating mathematics and offers a vast number of new ideas and possibilities to those who have solved the cube as well as to those who remain puzzled.
Amigurumi is the making of little crochet characters. Designers from all over the world help you surprise your friends and family with these engaging handmade gifts. The projects in this book cover all skill levels
This book provides an enjoyable and educational guide to the history, geometry, and practical construction of three-dimensional puzzles. It includes full coverage of the many different types of interlocking assembly puzzles, from burrs, Tangrams, and polyominoes to those using such polyhedra as the rhombic dodecahedron and truncated octahedron. The author, a well-known inventor and builder of solid geometrical puzzles, also describes numerous puzzles designed by himself and other inventors, many never before published. The volume is illustrated with over 200 line drawings and photographs to help enthusiasts build their own versions of these challenging and fascinating interlocking solids. Many unsolved problems are considered that will challenge mathematicians, computer buffs, and puzzle fanatics for years to come.
A PEEP AT THE CIRCUS was originally published in 1887 by McLoughlin Brothers, New York, New York.
A historical study on the ancient and popular Chinese puzzle game presents more than two thousand all-time tangrams, along with detailed instructions on how to arrange these intriguing puzzle tiles and presenting a variety of special puzzles for the reader to solve. Reprint.
Shows a variety of antique and modern puzzles, including puzzle locks and rings, and folding, impossible object, vanish, dexterity, sequential movement, disentanglement, interlocking, and take-apart puzzles