Sudoku 15 x 15 Level 4: Hard Vol. 1: Play Sudoku 15x15 Fifteen Grid With Solutions Hard Level Volumes 1-40 Sudoku Cross Sums Variation Travel Paper Lo (Paperback) (ISBN-13: 9798744711108)

Let's play Sudoku on a 15x15 grid! Sudoku 15x15 is a variation of the traditional Sudoku grid that must be solved by the rules of Sudoku using the numbers 1 to 15. This logic based number puzzle game using is super fun, kills boredom and is great for taking on the go when you travel by road, plane or train! Help your brain get smarter with this paper based Japanese number puzzle.

Sudoku 15x15 comes in 5 levels: Level 1: Very Easy Vol. 1 - 40, Level 2: Easy Vol. 1 - 40, Level 3: Medium Vol. 1 - 40, Level 4: Hard Vol. 1 - 40 and Level 5: Very Hard Vol. 1 - 40. Collect all 40 volumes of each level and solve them all! Achieve Sudoku greatness!