QUICK CHALLENGE · LOGIC

Sudoku

Fill each row, column, and 3×3 box with the numbers 1 through 9, using each number once.

EasyTime 00:00Best --:--
Checks 0Hints used 0

Choose a difficulty and start a new game.

Shared leaderboard

Shared leaderboard. Scores are posted only after you enter a nickname.

  1. No records yet.

How to play

Select an empty cell, then enter a number with the on-screen pad or keyboard keys 1 to 9. Duplicates in any row, column, or 3×3 box are highlighted. Use Check to review entries or Hint to fill one empty cell.

Desktop and mobile controls

On desktop, click a cell and type a number, or use the number pad. Arrow keys move the selection; Delete or Backspace clears a cell. On a phone or tablet, tap cells and number buttons.

Records

Your completion time is measured when you solve the puzzle. Easy, Normal, and Hard shared leaderboards are separate, and a nickname is required to post.

Frequently asked questions

  • Are duplicate numbers marked? Yes. Duplicates are highlighted and Check compares entries with the solution.
  • How many hints can I use? You can use a hint while empty cells remain. The game tracks how many you used.
  • Is Sudoku a cognitive diagnosis? No. It is a logic puzzle, not a medical or cognitive diagnosis.