PUZZLE / SUDOKU SITES
1.https://logicmastersindia.com/home/
2. https://www.sudokuwiki.org/sudoku.htm
3. http://www.argio-logic.net/
6. https://gp.worldpuzzle.org/
7. http://www.slpf.ch/pages/de/startseite.php
8. http://www.fed-sudoku.eu/enindex.php?co=/
9. http://www.puzzlefountain.com/
10. https://www.puzzlemix.com/
11. http://www.puzzlepicnic.com//
14. https://logic-masters.de/Wettbewerbe/CE/wettbewerb.php?chlang=en&id=159
PUZZLE / SUDOKU BLOGS
1.https://tcollyer.blogspot.com/
2.http://rohanrao.blogspot.com/
3.http://rishipuri.blogspot.com//
4.http://puzzleparasite.blogspot.com/
5. https://swaroopg92.blogspot.com/
6. http://sudokuvariante.blogspot.com/