![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/RrLQM.png)
logical deduction - A Sudoku with only four given digits and some more rules - Puzzling Stack Exchange
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Sudoku Puzzle Books for Kids: 200 : 4x4 Sudoku Puzzles Very Easy To Expert,with solutions,for beginners large print Volume 1: S.J. Learning Zone: 9798677880735: Amazon.com: Books
![A sample 4 × 4 Sudoku puzzle with enumerated candidate sets. Circle... | Download Scientific Diagram A sample 4 × 4 Sudoku puzzle with enumerated candidate sets. Circle... | Download Scientific Diagram](https://www.researchgate.net/publication/221439348/figure/fig1/AS:305550853197824@1449860408220/A-sample-4-4-Sudoku-puzzle-with-enumerated-candidate-sets-Circle-marks-naked-single.png)