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Sudoku

Solve classic 9×9 Sudoku boards with an intuitive interface, note-taking support, and auto-check.

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Game overview

Logic number placement

Remarkable Games’ Sudoku offers a clean web implementation of the classic puzzle. Each grid is solvable with logic, letting you toggle notes, highlight duplicates, or check mistakes. Finish a board to unlock another and keep your streak going.

Controls

Keyboard or mouse

  • Click / Tap a cell to select it.
  • Type digits 1–9 on your keyboard or use the on-screen number pad to fill cells.
  • Use note mode to jot candidates; toggle tools if provided (check instructions inside the app).

Why play it?

Brain workout

  • Classic rules with a modern interface and responsive layout.
  • Great for daily logic practice during short breaks.
  • Source code available for developers interested in puzzle generation techniques.

Tips

Think systematically

  • Start with singles—rows, columns, or boxes that only allow one number.
  • Use notes to track candidates and clear them as you eliminate options.
  • If stuck, scan each 3×3 box for missing digits and cross-check rows/columns.