Jacob N. Breetvelt

This plugin can display a sudoku puzzle diagram on your website. 
It comes with 200.000 unique puzzles in 7 different levels of difficulty. 
The number of times a puzzle is successfully solved or failed is registered. 
There is simple help and statistics available at the front-end.

WP Sudoku Plus

This plugin displays a sudoku puzzle diagram on your website that the visitor can try to solve.

orcas2016

If you want to learn to play sudoku, you may want to visit https://en.wikipedia.org/wiki/Sudoku.

Sudoku – The Game

Let your website visitors play the famous sudoku game.

WP Sudoku Plus vs Sudoku – The Game