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. Available as 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
• WebAssembly support: Run the Sudoku engine from browser via the rustoku-wasm crate
• Python bindings: Run the Sudoku engine from Python via therustoku-py crate

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.

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!