A free sudoku game — play it in your browser, no install. Self-contained Sudoku game with a backtracking generator and solver. Generates puzzles that are guaranteed to have exactly one solution.
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Controls: Tap a cell, then press 1–9. 0 / Backspace erases. Arrow keys move around the…
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Open the live demo Source on GitHubA self-contained Sudoku game with a backtracking generator and solver. Every puzzle it deals is guaranteed to have exactly one solution.
One HTML file — no build step, no dependencies, no network calls.
Play the demo in your browser →
Conflicting cells are highlighted as you type, so you catch mistakes immediately instead of at the end.
The interesting part is not the UI — it's generating a puzzle that is uniquely solvable without brute-forcing forever.
1. Build a full solved grid.
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