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.
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Open the live demo Source on GitHubSolve 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.
Open the live demo.
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