Rustoku

Lightning-fast Sudoku solving and generation, crafted in Rust.

Rustoku is a highly optimized Sudoku puzzle solver and generator built with a focus on speed and clarity. It leverages bitmasking for constraint tracking and a backtracking algorithm with MRV for puzzle navigation. Try the demo in your browser, or install the Rust library and CLI crates.

• Fast solving with clear solve paths: Rustoku can find solutions in microseconds, even for the most complex puzzles. Plus, it shows you the step-by-step solve path for understanding how the solution was reached
• Unique and configurable puzzle generation: Create Sudoku puzzles that are guaranteed to have only one solution. You can also customize the difficulty of the puzzle to your liking
• Human-like puzzle solving: Beyond raw speed, it mimics human expertise, employing a full range of techniques from Naked Singles to X-Wing to solve puzzles with precision
• Multi-platform access: Use Rustoku as a Rust library or CLI, run it in the browser via the rustoku-wasm crate or call it from Python via rustoku-py, or try the live demo

Documentation

Comprehensive guides are available for all distribution channels:

• CLI User Guide - Reference for terminal usage.
• Library User Guide - For Rust developers using rustoku-lib.
• WebAssembly Guide - Browser-side integration.
• Python Guide - Using the engine from Python.

Getting Started

Commands to get you going:

# This installs the binary at $HOME/.cargo/bin
cargo install rustoku-cli

# Generate puzzles
rustoku-cli generate
rustoku-cli generate --clues 45
rustoku-cli generate --difficulty expert

# Solve puzzles
rustoku-cli solve any 530070000600195000098000060800060003400803001700020006060000280000419005000080079
rustoku-cli solve any --human --verbose 801027003000600080005040010000070809900000050600900200000230160570160000000000000
rustoku-cli solve all 295743001431865900876192543387459216612387495549216738763500000000000000000000000
rustoku-cli solve all --until 5 000000500080760092001005470056309000009001004320500010000200700700000000000000000
rustoku-cli solve csv sudoku.csv

# Check solutions
rustoku-cli check 295743861431865927876192543387459216612387495549216738763524189154938672928671354

# Display puzzle
rustoku-cli show 900507400007080000830401006402000300090000065000050080200908000080074000700210803

Example output from the show command:

+-------+-------+-------+
| 9 . . | 5 . 7 | 4 . . |
| . . 7 | . 8 . | . . . |
| 8 3 . | 4 . 1 | . . 6 |
+-------+-------+-------+
| 4 . 2 | . . . | 3 . . |
| . 9 . | . . . | . 6 5 |
| . . . | . 5 . | . 8 . |
+-------+-------+-------+
| 2 . . | 9 . 8 | . . . |
| . 8 . | . 7 4 | . . . |
| 7 . . | 2 1 . | 8 . 3 |
+-------+-------+-------+
Line format: 900507400007080000830401006402000300090000065000050080200908000080074000700210803

Try some more examples from these sites:

• HoDoKu
• heetbeet/purge-and-merge
• ruohanrao/sudoku
• Ritvik19/Sudoku-Dataset

Dive into the world of high-performance Sudoku today!