109 Volcano Sudoku comes from the publisher of the most popular Sudoku series in Iceland, 109 Japanese Sudoku.

With 11 Sudoku books in the series and more than 50.000 books sold since 2005 (that is a lot for a nation of 320.000 people!) you can be sure to find fun and exciting Sudoku puzzles in this book.

The book contains 20 easy puzzles, 30 medium, 30 hard and 20 very hard puzzles. The last 9 puzzles are Samurai puzzles; a combination of five puzzles in one – an extreme challenge!