Okoker sudoku Description:

Okoker Sudoku is one of the most amazing, challenging, intriguing, and entertaining puzzles to sweep the world in decades. It has a unique solution that can be reached logically without guessing. Enter digits from 1 to 9 into the blank spaces. Every row must contain one of each digit. So must every column, as must every 3x3 square.
Discover the Simplest Method to solve Sudoku puzzles... (anyone who passed grade school can learn it!)
Help you exercise your brain , help you have a clever brain.
It's fun. It's challenging. It's addictive!
There are different degrees of difficulty.