the Calcudoku Series - January: 100 puzzles of great variety every month

By Patrick Min

This is the first issue of the new "Calcudoku Series" puzzle books (so far, six have been released, January-June 2016). Each month there will be a new puzzle book with 100 Calcudoku puzzles of the greatest variety (from easy to difficult, with twins, "no-op" puzzles, single operator, patterned, up to 15x15 in size!), at the lowest possible price.And solutions to the difficult puzzles in the book can be submitted at calcudoku.org for points!

• Format: Paperback
• Language: English
• ISBN: 1519630123
• ISBN13: 9781519630124
• Release Date: December 2015
• Publisher: CreateSpace Independent Publishing Platform
• Length: 108 Pages
• Weight: 0.55 lbs.
• Dimensions: 9.6" x 0.3" x 6.7"