sudoku-variants

A flexible Sudoku engine for Rust that supports common variations and custom rules.

Features

• Parsing and printing Sudoku
• Checking validity of Sudoku and solutions according to standard rules as well as some common variants
• Injection of custom constraints
• Solving Sudoku using a perfect backtracking algorithm
• Generating Sudoku, with a possibility to specify a custom solver that has to be able to solve the result, thus controlling the difficulty

Planned Improvements

• Allow stateful constraints that can be reduced, such as Killer Sudoku
• Implement some more common constraints (e.g. Killer, Sandwich, Mini-Killer, maybe more)
• Provide a family of solvers that use patterns and logic, much like a human, to allow users to define a difficulty without writing their own solver
• Improve the performance of the perfect backtracking solver