Duncan's SuDoku Solver

What is the definition of a Sudoku puzzle? Is there always at least one possible solution to a Sudoku puzzle (no matter how ridiculous)? If not, then what would be an example

Duncan's SuDoku Solver

Puzzlewright Guide to Solving Sudoku: Hundreds of Puzzles Plus Techniques to Help You Crack Them All: Longo, Frank, Gordon, Peter: 9781402799457: : Books

Sudoku Using Constraint Satisfaction, PDF, Computing

Extreme Sudoku Puzzle Book for by Publishing, Puzzle King

Sudoku Hard To Extreme: Sudoku Activity Book Puzzles With Different Levels for Smart Adults People, Over 500 Puzzles for Everyone With Solutions: Andrews, Amy J.: 9798720752385: : Books

Duncan's SuDoku Solver

Sudoku Solver by Andrew Stuart

Next step? I can't see it : r/sudoku

Mastering Sudoku @

10 Sudoku Tips and Tricks That'll Help You Solve Faster - Mastering Sudoku