Let's play Triple Doku on three 9 x 9 grids with two 6 x 6 overlap! Triple Doku is a variation of the traditional Sudoku grid that must be solved using the rules of Sudoku with numbers 1 to 9 making sure the three grids including the overlapping regions are also solved with no repeated numbers. This logic based number puzzle game is super fun, kills boredom and is great for taking on the go when you travel by road, plane or train! Help your brain stay sharp and get smarter with this paper based Japanese number puzzle book. Triple Doku Sudoku 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!