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sudoku graph coloring

A free sudoku game — play it in your browser, no install. Solve any standard 9x9 Sudoku with exact graph coloring. Interactive browser demo, real backtracking traces, Python solver, and a verified 16:9 animation.

by @ChetasLua · ChetasLua/sudoku-graph-coloring on GitHubLANG Python★ 11HOSTED ON CHETASLUA.GITHUB.IOUPDATED 20 Sep 2026

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From the README

Solve any standard 9×9 Sudoku using exact graph coloring, and watch the actual search.

Try the live solver · Download the video · How it works

81 vertices. 810 edges. Nine colors. No stored answer grids or third-party Sudoku solver.

The browser app runs entirely on your device. Enter your own clues, paste a puzzle, or try the bundled examples. It checks for a second solution, distinguishes conflicting clues from an impossible puzzle, and lets you replay assignments, dead ends, and backtracking.

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Read the full README on GitHub →

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