Responsive online game

Sudoku with notes, real-time validation and local autosave

Play on desktop or mobile with accessible 9x9 grid, keyboard navigation, difficulty levels, auto win check, and browser saved progress.

Features
  • Mouse, touch, and keyboard selection
  • Cell notes and erase option
  • Highlighted row, column, and block conflicts
  • Easy, medium, and hard with timer and autosave
  • Progress saved in this browser so you can resume a match

Generating Sudoku

Preparing a new grid with valid solution

A new solution is prepared and clues are removed while keeping each difficulty level consistent.

How to play

Quick Sudoku Rules

  1. Fill the 9x9 grid with numbers 1 to 9 without repeating in any row.
  2. Each column must also contain numbers 1 to 9 exactly once.
  3. Each 3x3 block follows the same non-repeating number rule.
  4. Use notes when there are multiple possibilities for a cell.
  5. Highlighted conflicts help spot invalid moves in real time.
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Who it is for

Train logic with a number puzzle

Sudoku is for people who enjoy reasoning challenges, want a short break in the day, or practice focus and deduction.

  • Choose between three difficulty levels.
  • Use notes to track possibilities in each cell.
  • Resume the game later in the same browser.
Instructions

How to play

  1. 1. Choose the difficulty.
  2. 2. Select an empty cell with the mouse, touch, or arrow keys.
  3. 3. Type a number from 1 to 9 or use the on-screen keypad.
  4. 4. Complete the grid without repeating numbers in rows, columns, and blocks.
How it works

Fewer clues, more deduction

The grid has 81 cells. Each level removes a different number of digits from the full solution.

Easy

43 starting numbers.

More clues to warm up and learn the pace.

Medium

35 starting numbers.

Requires watching rows, columns, and blocks at the same time.

Hard

29 starting numbers.

Notes help track the possibilities.

Verifiable example

Finding a number by elimination

If a row already has 1, 2, 3, 4, 5, 6, 7, and 8, the only empty cell in that row can only take 9.

Numbers in the row
1 to 8
Remaining cell
9

The same logic applies to columns and 3x3 blocks.

Limits

Local progress

The game saves the match in this browser.

  • Clearing browser data erases progress and records.
  • Progress is not synced across devices.
  • Highlighted conflicts show repetition, not whether a move leads to the solution.
FAQ

Perguntas frequentes

How to play Sudoku?

Fill the 9x9 grid with numbers 1 to 9 without repeating any number in a row, column, or 3x3 block.

Does Sudoku show errors automatically?

Yes. You can toggle conflict highlighting on or off for guided or classic play.

Is progress saved if I leave?

Yes. The game automatically saves your active game, board state, notes, level, and timer in this browser.

Can I play Sudoku on mobile and keyboard?

Yes. The interface is responsive and supports touch, mouse, and keyboard arrows, numbers, Delete, and Backspace.

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