| http://en.wikipedia.org/wiki/Sudoku | - | Wikipedia about Sudoku. |
| http://sudoku.startpagina.nl | - | Dutch - Refers to many other Sudoku sites. |
| http://sudoku.startpagina.be | - | Dutch - Refers to many other Sudoku sites. |
| http://sudoku.startkabel.nl | - | Dutch - Refers to many other Sudoku sites. |
©2011, Renze de Waal.