![logical deduction - A Sudoku with only four given digits and some more rules - Puzzling Stack Exchange logical deduction - A Sudoku with only four given digits and some more rules - Puzzling Stack Exchange](https://i.stack.imgur.com/r5iE5.jpg)
logical deduction - A Sudoku with only four given digits and some more rules - Puzzling Stack Exchange
![Workaholic die oppas-opa avant la lettre werd | Rien van den Anker Journalist, columnistRien van den Anker Journalist, columnist Workaholic die oppas-opa avant la lettre werd | Rien van den Anker Journalist, columnistRien van den Anker Journalist, columnist](http://www.rienvandenanker.nl/wp-content/uploads/2015/09/150525-Foto-Aad-van-de-Wetering-portret-2.jpg)
Workaholic die oppas-opa avant la lettre werd | Rien van den Anker Journalist, columnistRien van den Anker Journalist, columnist
![Magic Square Sudoku with only 4 digits by Aad van de Wetering! Can you solve? Rules in the comments. #SundayChallenge - 9GAG Magic Square Sudoku with only 4 digits by Aad van de Wetering! Can you solve? Rules in the comments. #SundayChallenge - 9GAG](https://images-cdn.9gag.com/photo/aKdbPq1_700b.jpg)
Magic Square Sudoku with only 4 digits by Aad van de Wetering! Can you solve? Rules in the comments. #SundayChallenge - 9GAG
![Simon Stuifbergen - Jan Breetveld - Fred van Wetering - Aad Zonneveld en Hans Zijp. (foto 503051 uit de beeldbank Oud-Castricum) Simon Stuifbergen - Jan Breetveld - Fred van Wetering - Aad Zonneveld en Hans Zijp. (foto 503051 uit de beeldbank Oud-Castricum)](https://oud-castricum.nl/beeldbank/large/503/503051.jpg)
Simon Stuifbergen - Jan Breetveld - Fred van Wetering - Aad Zonneveld en Hans Zijp. (foto 503051 uit de beeldbank Oud-Castricum)
![Puzzle a Day on X: "Puzzle: The World's Hardest Sudoku Today's puzzle was created by Aad van de Wetering. #Puzzle #Puzzles #PuzzleADay #PuzzleForToday https://t.co/zijtc3ioig" / X Puzzle a Day on X: "Puzzle: The World's Hardest Sudoku Today's puzzle was created by Aad van de Wetering. #Puzzle #Puzzles #PuzzleADay #PuzzleForToday https://t.co/zijtc3ioig" / X](https://pbs.twimg.com/media/Et0sYs7VgAMxitv.jpg)