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Classic Sudoku

0Moves
0Empty
9 × 9 · The original0 / 81 filled

Every row, column and box needs 1–9.

ONE SQUARE AT A TIME

Classic Sudoku

Fill every empty square with a number from 1 to 9. Each row, column and 3 × 3 box must contain every number exactly once.

  1. Use the numbers 1–9, with no repeats in any row or column.
  2. Each outlined 3 × 3 box also needs every number exactly once. Printed starting numbers cannot be changed.
  3. Select an empty square and use the number pad or your keyboard. Notes let you pencil in possible numbers.
  4. Every puzzle has exactly one solution. Repeated numbers are marked with an ×. Hint reveals a correct number; Undo restores the previous move, including notes.
Keyboard

Arrow keys move through the grid. Number keys fill a square. N toggles notes. Backspace or Delete erases. H reveals a correct number, Ctrl/⌘ Z undoes, and F toggles fullscreen.

Each variant saves separately on this device, including up to 100 undo steps. Offline play is ready when the menu says “Available offline”.

A FRESH START

A new puzzle?

Choose a fresh puzzle with one solution, or replay this one. This replaces your current progress in Classic Sudoku.

EVERY NUMBER IN ITS PLACE

Beautifully solved.