Sudoku 3: Hard to Extreme: 200 Puzzles: Hard to Extreme

By Chronicle Books

Perfect for sharpening concentration and reasoning skills, here are 200 all-new Sudoku puzzles that build in difficulty level from hard to very challenging. A musthave for every on-the-go Sudoku sleuth!

• Format: Spiral-bound
• Language: English
• ISBN: 1452101744
• ISBN13: 9781452101743
• Release Date: January 2011
• Publisher: Chronicle Books
• Length: 262 Pages
• Weight: 0.35 lbs.
• Dimensions: 0.8" x 3.7" x 5.7"
• Age Range: 18 years and up
• Grade Range: Postsecondary