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Sudoku is a logic-based number placement puzzle. It was invented in the U.S. in 1979 under the name "Number Place", and became popular in Japan in 1986, where it was dubbed Sudoku ("single number"). It then spread internationally in 2005. The objective is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 boxes (also called blocks or regions) contains the digits from 1 to 9. The puzzle creator provides a partially completed grid, and the player has to figure out the rest. Web Sudoku allows you to play with the puzzles online with your browser, rather than having to buy printed books of puzzles. And don't worry about running out of puzzles: based on the rules set forth, there are 6,670,903,752,021,072,936,960 possible puzzle grids. From This is True for 15 September 2007 Suggestions for further reading:
 List Price: $12.95 Amazon Price: $10.36 Editorial Review: It's smart. It's stylish. It's fun! And with its unique design, Will Shortz Presents The Little Black Book of Sudoku is bound to be the "must-have" collection for any puzzle fan. Edited by crossword great Will Shortz, this beautiful book offers 400 easy-to-hard puzzles in a convenient portable size, perfect for carrying in your purse, briefcase, or backpack. Features: * 400 sudoku puzzles, arranged according to difficulty * Sleek design with a covered spiral binding makes it easy to solve puzzles * Durable hardcover protects the book as it travels with you wherever you go* The perfect gift for any holiday* Edited by Will Shortz.  By: Zachary Pitkow List Price: $6.95 Amazon Price: $6.95 Editorial Review: Sudoku craze and pairs the addictive logic-based game with a spectacularly handy format. Filled with 200 grids of varying difficulty, our pocket-sized hardcover notepads are perfect for strategizing on the bus or train. Now that's what we call a smart calculation!  By: Peter GordonFrank Longo List Price: $17.95 Amazon Price: $12.21 Editorial Review: Here it comes: a revolution in sudoku solving! This is by far the most complete guide to cracking these addictive puzzles ever produced, with tricks even the experts won?t know. While most books might have a few pages of introduction before proceeding straight to the sudokus, this one covers it all. Hidden pairs, naked pairs, X-wings, jellyfish, squirmbag, bivalue and bilocation graphs, turbot fish, grid coloring, chains: every single one is here, and much more too, including the exclusive Gordonian logic methods (Gordonian rectangles and Gordonian polygons) that will turn even the hardest puzzles into a breeze. Of course, there are hundreds of sudoku for practice. A very special addition: a reprint of the very first sudoku ever published in 1979, from Dell Pencil Puzzles and Word Games magazine!  By: Will Shortz List Price: $6.95 Amazon Price: $6.95 Editorial Review: Are you tough enough? Take on this collection of 200 devilishly difficult sudoku puzzles! Includes: -200 hard puzzles-Perfect portable size-Big grids for easy solving  By: Wayne Gould List Price: $6.95 Amazon Price: $6.95 Editorial Review: 200 New Puzzles -- From Fiendish to Super Fiendish Su Doku, "the crossword without words," comes with a warning: it is seriously addictive. You don't need to be a mathematical genius to solve these puzzles; it is simply a question of logic and a little patience. |
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