Brown Belt Sudoku by Michael Rios

From the Publisher

Sudoku Puzzles for Everyone, From Novices to Masters! At home, while commuting, during lunch hours...people around the world are eagerly working on Sudoku puzzles whenever and wherever they can!

Created in the United States, these intriguing conundrums were originally called Number Place puzzles. Their recent rise in popularity began in Japan, where the name translated as sudoku. Here we've indicated the skill level necessary to complete each sudoku book in this series in the same way Japanese karate levels are ranked: by different colored belts. This is the Brown Belt volume, a terrific choice for anyone who is ready for intermediate puzzles that are more difficult than might be expected.

It's impossible to complete only one sudoku at a time, because solving them is habit-forming!

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