Tridoku Level 4: Extreme Vol. 31: Play Triangle Sudoku With Solutions 9x9 Triangle Grids Hard Level Volumes 1-40 Variation Tridoku Travel Paper Logic ... Concentrate All Ages Kids to Adult Gifts

Let's play Tridoku, a triangular version of Sudoku! Tridoku Sudoku is a variation of the traditional Sudoku grid that must be solved using the rules of Sudoku. 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. Tridoku comes in 4 levels: Level 1: Easy Vol. 1 - 40, Level 2: Medium Vol. 1 - 40, Level 3: Hard Vol. 1 - 40 and Level 4: Extreme Vol. 1 - 40. Collect all 40 volumes of each level and solve them all! Achieve Sudoku greatness!