Multiplying my age by 6 then subtracting 6 produces the same result as subtracting 7 from my age then multiplying by 7. How old am I? On my broken calculator with keys + - ÷ x =, the only functional number is 7. How can I get 34 to appear in the readout? A country mints four denominations of coins, in whole numbers of cents. It takes four of these coins to make 21¢, or 24¢, or 25¢, or 26¢. What are the denominations of the coins? These and almost 300 other mathematical puzzles appear in this original collection, devised by world-renowned mathematicians, puzzle creators, and devoted puzzle lovers. A unique puzzle project, it unites the efforts of a dozen authors, including software engineer Andrea Gilbert and Bram Cohen, author of the P2P BitTorrent protocol. Seventeen different types of challenges include 3-D puzzles, chess puzzles, connections, dissections, foldings, geometrical puzzles, logic problems, matchstick puzzles, mazes, moving pieces, number puzzles, put-togethers, strimko, sudoku, visual puzzles, weightings, and word puzzles. The difficulty level of each puzzle is marked by stars, ranging from 2 to 5. Average difficulty level is about 3 stars, promising puzzle enthusiasts many entrancing hours of solving and enjoyment.

Puzzle Box, Volume 1 (Dover Brain Games & Puzzles)

Humor & Entertainment

Knuth, Donald

Nelson, Harry

Grabarchuk, Tanya

Grabarchuk, Helen

Gilbert, Andrea

Pegg Jr., Ed

Friedman, Erich

Hazzard, Shelly

Candy, Richard

Cohen, Bram

Puzzles & Games

Dover Publications

In a foot race, Abe was neither first nor last. Cal beat Doug, Bruce beat Abe, Abe beat Ed but was beaten by Cal, and Doug beat Bruce. Who was last? Arrange four chess pieces so that every piece attacks exactly four empty squares. In the USA, is it possible to travel by car in such a way that you visit exactly seven states and enter them in alphabetical order? What do these words have in common: commerce, canoodle, funnel, recessive? You have 12 pounds of nails and a large 2-pan balance. How can you measure out 9 pounds of nails? Find identical jigsaw puzzle pieces, rearrange digits to form correct equations, solve crossword puzzles that spell out pithy quotations, and revel in other original brainteasers. This successor to Puzzle Box, Volume 1 presents another 300 challenges created by a team of a dozen renowned mathematicians and puzzle creators. Seventeen different types of puzzles include 3-D puzzles, chess puzzles, connections, dissections, foldings, geometrical puzzles, logic problems, matchstick puzzles, mazes, moving pieces, number puzzles, put-togethers, strimkos, sudoku, and visual and word puzzles. The difficulty level of each puzzle is marked by stars, ranging from 2 to 5; 3 stars indicate an average-level challenge. Whether you prefer picture puzzles or word puzzles or number puzzles, this fun-filled collection guarantees hours of entertainment.

Puzzle Box, Volume 2 (Dover Brain Games & Puzzles)

Sarcone, Gianni A.

Parr, Andy

Yurtoglu, Hasan

Hazard, Suzanne

A car dealer sells two cars for $9,999 each — one at a 10% profit, the other at a 10% loss. Overall, did the dealer make or lose money? How many common words of six letters can you make from "machine," using each letter only once per word? Raoul asked his brother's wife's mother-in-law's only husband's only daughter to join him and his wife for lunch. What relation is she to Raoul? Decipher hidden quotes, reposition matchsticks to form equilateral triangles, navigate complex mazes, and solve scores of other intriguing challenges with this puzzle treasury. The third in a series of collected brain-teasers, conundrums, and riddles, this volume presents a splendid variety of puzzles created by a dozen renowned mathematicians and puzzle lovers. The 300 original exercises, printed in full color, include 19 different kinds of puzzles, including: 3-D puzzles, chess puzzles, connections, dissections, foldings, geometrical puzzles, logic problems, matchstick puzzles, mazes, moving pieces, number puzzles, put-togethers, strimkos, sudoku, and visual and word challenges. The difficulty level of each puzzle is marked by stars, ranging from 2 to 5; 3 stars indicate an average-level challenge. Complete solutions for every puzzle are included.

Puzzle Box, Volume 3 (Dover Brain Games & Puzzles)

Kilick, Ali

Shasha, Dennis

Strimko is a logic number puzzle invented by The Grabarchuk Family in 2008. It is based on the idea of Latin squares described by a Swiss mathematician and physicist Leonhard Euler (1707-1783) in the 18th century. All Strimko puzzles are solvable with a pure logic, no special knowledge is required. Strimko uses only three basic elements: rows, columns, and streams. All elements have equal numbers of cells, and the goal is to make each row, column, and stream containing the whole set of specified numbers. Cells in the grid are organized into several streams of equal length, which often run diagonally and even branching. Such mechanics creates entangled patterns resulting in interesting challenges and unusual logic. This book contains a specially designed collection of 150 easy-to-master puzzles with 4 x 4 through 7 x 7 grid sizes. Puzzles are arranged from the easiest to the hardest ones so that you’ll progress in solving skills with each next puzzle. Strimko challenges were handcrafted by Helen, Tanya, Serhiy, and Peter Grabarchuk, and up to date hundreds of original Strimko puzzles were published in various forms and platforms. Learn more at strimko.com. Happy puzzling!

Strimko Book 1: 150 Easy-to-Master Number Logic Puzzles

Grabarchuk, Serhiy

Grabarchuk, Peter

Independently published

Strimko is a logic number puzzle invented by The Grabarchuk Family in 2008. It is based on the idea of Latin squares described by a Swiss mathematician and physicist Leonhard Euler (1707-1783) in the 18th century.All Strimko puzzles are solvable with a pure logic, no special knowledge is required. Strimko uses only three basic elements: rows, columns, and streams. All elements have equal numbers of cells, and the goal is to make each row, column, and stream containing the whole set of specified numbers. Cells in the grid are organized into several streams of equal length, which often run diagonally and even branching. Such mechanics creates entangled patterns resulting in interesting challenges and unusual logic. This book contains a specially designed collection of 150 easy puzzles with 4 x 4 grid sizes. Puzzles are arranged from the easiest to the hardest ones so that you'll progress in solving skills with each next puzzle.Strimko challenges were handcrafted by Helen, Tanya, Serhiy, and Peter Grabarchuk, and up to date hundreds of original Strimko puzzles were published in various forms and platforms. Learn more at strimko.com. Happy puzzling!

Strimko 4x4: 150 Easy Number Logic Puzzles

Strimko is a logic number puzzle invented by The Grabarchuk Family in 2008. It is based on the idea of Latin squares described by a Swiss mathematician and physicist Leonhard Euler (1707-1783) in the 18th century. All Strimko puzzles are solvable with a pure logic, no special knowledge is required. Strimko uses only three basic elements: rows, columns, and streams. All elements have equal numbers of cells, and the goal is to make each row, column, and stream containing the whole set of specified numbers. Cells in the grid are organized into several streams of equal length, which often run diagonally and even branching. Such mechanics creates entangled patterns resulting in interesting challenges and unusual logic. This book contains a specially designed collection of 150 medium puzzles with 5 x 5 grid sizes. Puzzles are arranged from the easiest to the hardest ones so that you’ll progress in solving skills with each next puzzle. Strimko challenges were handcrafted by Helen, Tanya, Serhiy, and Peter Grabarchuk, and up to date hundreds of original Strimko puzzles were published in various forms and platforms. Learn more at strimko.com. Happy puzzling!

Strimko 5x5: 150 Medium Number Logic Puzzles

Strimko is a logic number puzzle invented by The Grabarchuk Family in 2008. It is based on the idea of Latin squares described by a Swiss mathematician and physicist Leonhard Euler (1707-1783) in the 18th century.All Strimko puzzles are solvable with a pure logic, no special knowledge is required. Strimko uses only three basic elements: rows, columns, and streams. All elements have equal numbers of cells, and the goal is to make each row, column, and stream containing the whole set of specified numbers. Cells in the grid are organized into several streams of equal length, which often run diagonally and even branching. Such mechanics creates entangled patterns resulting in interesting challenges and unusual logic. This book contains a specially designed collection of 150 hard puzzles with 6 x 6 grid sizes. Puzzles are arranged from the easiest to the hardest ones so that you'll progress in solving skills with each next puzzle.Strimko challenges were handcrafted by Helen, Tanya, Serhiy, and Peter Grabarchuk, and up to date hundreds of original Strimko puzzles were published in various forms and platforms. Learn more at strimko.com. Happy puzzling!

Strimko 6x6: 150 Hard Number Logic Puzzles

Strimko is a logic number puzzle invented by The Grabarchuk Family in 2008. It is based on the idea of Latin squares described by a Swiss mathematician and physicist Leonhard Euler (1707-1783) in the 18th century. All Strimko puzzles are solvable with a pure logic, no special knowledge is required. Strimko uses only three basic elements: rows, columns, and streams. All elements have equal numbers of cells, and the goal is to make each row, column, and stream containing the whole set of specified numbers. Cells in the grid are organized into several streams of equal length, which often run diagonally and even branching. Such mechanics creates entangled patterns resulting in interesting challenges and unusual logic. This book contains a specially designed collection of 150 master puzzles with 7 x 7 grid sizes. Puzzles are arranged from the easiest to the hardest ones so that you’ll progress in solving skills with each next puzzle. Strimko challenges were handcrafted by Helen, Tanya, Serhiy, and Peter Grabarchuk, and up to date hundreds of original Strimko puzzles were published in various forms and platforms. Learn more at strimko.com. Happy puzzling!

Strimko 7x7: 150 Master Number Logic Puzzles

See the best price to sell, buy, or rent books by Grabarchuk, Tanya. BookScouter helps to compare book prices from 25+ online bookstores and 30+ buyback vendors with a single search.

Books by Grabarchuk, Tanya