This Pocket Sudoku Puzzle Book series with different difficulty levels - EASY, MEDIUM, HARD, EXTREME is designed for frequent travelers. With its compact size of 5"x8" but with easily visible puzzles, it can be put in any of your cases or even in jackets. It is a nice companion to you while you are traveling on the road, rail, or plane. Each Level of the Pocket Puzzle Books has 120 puzzles with 2 puzzles on each page. Solutions included. You can build up your Sudoku skills step by step completing the 4 difficulty levels from EASY to MEDIUM to HARD to EXTREME. After completing each Level, Do not miss the download link on the last page for additional puzzles for your warming up to challenge the next level.
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