True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku?

Finnish mathematician Arto Inkala spent three months designing a Sudoku puzzle with only one solution. On the scale of 1-5 in difficulty, he rated the puzzle as 11.

Extra tricky. Extra tough. It's the sudoku collection that's not for the faint of heart. If you're craving the challenge, sharpen your pencil and pit

Genius-Level Sudoku: Over 300 Super-Difficult Puzzles from the Japanese Masters Who Invented the Game

About the Book Our hardest-yet Sudoku collection, handcrafted by the puzzle masters at Nikoli in Japan (whose Workman Sudoku books have 1.3 million

Genius-Level Sudoku - by Nikoli Publishing (Paperback)

Focus4 2E Students Book With Answers, PDF, Phrase

Alexandra Links - Alexandra Middle School

If you're an experienced sudoku puzzle solver looking for a real challenge, then the World's Hardest Sudoku Book: 200 of the World's Toughest Sudoku

World's Hardest Sudoku Book: 200 of the World's Toughest Sudoku Puzzles (Volume 2)|Paperback

[Hoshiko, Masaki] on . *FREE* shipping on qualifying offers. The Hardest Sudokos In Existence: The Sudoku Puzzle Book For Th

The Hardest Sudokos In Existence: The Sudoku Puzzle Book For The Most Experienced Players (Ranked As The Hardest Sudoku Collection Available In The

Rex Parker Does the NYT Crossword Puzzle: Basic linguistic unit / THU 10-13-16 / Magical creatures in Jewish folklore / French locale of fierce WWI fighting / Baked chocolaty treat / Part

A Sudoku with 17 clues and its unique solution.

True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku?

A.J. Jacobs on Solving Life's Puzzles - Econlib

Mature Living Magazine - Oct/Nov Edition by Adams Street Publishing Co. - Issuu

Extra tricky. Extra tough. It's the sudoku collection that's not for the faint of heart. If you're craving the challenge, sharpen your pencil and pit

Genius-Level Sudoku: Over 300 Super-Difficult Puzzles from the Japanese Masters Who Invented the Game