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.

Berries and Company

The morepuzzles plugin is perfect choice for those who would like to post a crossword or wordsearch puzzle on their page.
This plugin is for a 3rd party <a href="https://morepuzzles.com" rel="nofollow ugc">morepuzzles.com</a> site, where you can create custom puzzles and only puzzles generated by this page can be used. You must register a user on <a href="https://morepuzzles.com" rel="nofollow ugc">morepuzzles.com</a> to be able to make and share your puzzles. Shortcodes can be generated by this plugin using the shared links and these shortcodes can be used on your WordPress page. Your puzzle data is stored on <a href="https://morepuzzles.com" rel="nofollow ugc">morepuzzles.com</a>, due to the fact that all puzzles are created there.
Page site: <a href="https://morepuzzles.com" rel="nofollow ugc">morepuzzles.com</a> 
Privacy Policy: https://morepuzzles.com/privacy-policy 
Terms of Service: https://morepuzzles.com/terms-of-service
In order to be able to use our plugin, you must do these steps:
<ul>
<li>visit morepuzzles.com</li>
<li>create an account</li>
<li>create a crossword or wordsearch puzzle</li>
<li>share the puzzle and copy the generated shared link.</li>
<li>insert the link into the plugins shortcode generator.</li>
</ul>

MorePuzzles

This plugin is for those who would like to insert an interactive crossword/word-search puzzle to their page.

WP Sudoku Plus vs MorePuzzles