If you found the software useful donation is something you might consider :-)

Janet-Sudoku - Java Android .NET Sudoku Generator & Sudoku Solver Library

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Sudoku Solver API

• simple solving
• path / sequence leading to the solution
• evaluating solution existence
• finding all solutions
• puzzle / solution loading / saving
• solving randomization options
• error handling (error codes, messages)

Sudoku Generator API

• random generator
• generator based on puzzle
• generating randomization options
• error handling (error codes, messages)

Store API enabling variety of operations

• 160 built-in puzzle examples
• A bunch of built-in operations enabling puzzle modification (i.e. rotation, reflection, swapping, permutation, ...)
• Puzzle checking
• Puzzle loading and saving
• Rating puzzle difficulty

Janet Sudoku Demo App - command line tool based on the library

• Puzzle loading
• Puzzle generating
• Puzzle evaluating
• Puzzle solving
• Puzzle rating
• Puzzle saving

Regression tests

• Large number of regression / unit tests

If you found the software useful donation is something you might consider :-)