Double Black Diamond Hard Sudoku

By Frank Longo

Warning: danger ahead! These treacherously tough puzzles all require upper-level solving techniques to conquer. So, if you want hard sudoku thats easy to take on the go, this Sit & Solve(R) collection is the ticket. Attractively packaged, its a terrific gift or stocking stuffer for hardcore sudoku fans.

• Format: Paperback
• Language: English
• ISBN: 1454906995
• ISBN13: 9781454906995
• Release Date: May 2013
• Publisher: Puzzlewright
• Length: 96 Pages
• Weight: 0.15 lbs.
• Dimensions: 0.5" x 4.3" x 5.9"