SudokuPlay free online Sudoku in your browser. Solve classic 9x9 logic grid puzzles with pencil notes, smooth controls, and clean deduction.
Sudoku
Sudoku is the definitive classic logic puzzle that tests grid deduction without requiring any math. Starting with a partially populated 9×9 board, your task is to fill every remaining square so that each row, column, and 3×3 block contains the digits 1 through 9 exactly once.
Each session offers a clean, calm mental workout where every placement relies purely on process of elimination. Whether you are solving a straightforward daily puzzle or untangling a dense high-difficulty grid, finding that single missing number in a crowded section provides an instantly satisfying feeling of order.
Controls
Play comfortably using touch or full keyboard support in your web browser:
- Mouse / Touch: Click or tap a cell on the grid to select it, then select a number from the on-screen keypad to place your entry.
- Keyboard: Navigate between squares using the Arrow Keys or WASD, press number keys 1–9 to input values, and use Backspace or Delete to clear a mistake.
Proven Solving Strategies
- Cross-Hatching: Focus on a single digit at a time. Trace rows and columns where that number already lives to pinpoint squares in nearby 3×3 subgrids where it cannot possibly go.
- Use Pencil Notes: When a cell has only two or three valid candidates left, note them down. Marking candidates keeps track of possibilities and helps uncover naked pairs or hidden triples.
- Scan Almost-Complete Lines: Check rows, columns, or 3×3 boxes that only have one or two open spaces left. Solving these obvious gaps opens up new clues for adjacent sections.
- Avoid Guessing: Every proper Sudoku puzzle has a single logical solution. Blind guessing usually leads to subtle errors several steps later—if you get stuck, re-check your candidate notes instead.
Looking for more brain-teasers? Explore our collection of puzzle games on Pork Games for quick logic challenges and daily casual play.