kolenko.dev

Sudoku

Generate and play Sudoku puzzles at various difficulty levels.

play

Play Sudoku

Progress

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Difficulty

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Puzzle solved!

Good job! You've successfully completed the Sudoku puzzle. You can create a new puzzle and play again.

50%

Notice

This will reset the current puzzle and all progress will be lost.
new

Start new puzzle

50%
how-to-play

How to play

Instructions

  • Select a difficulty and start a new puzzle.
  • Each number must appear only once per row, column, and 3x3 box.
  • To enter a number, click on an empty cell and enter a number (1-9).
  • Check your progress in the dock and try to complete the puzzle with no errors!

Tools

  • Notation Mode: Add small pencil marks for possible numbers in a cell. To remove a number, enter it again. Otherwise, backspace will remove the last pencil mark.
  • Assisted Mode: Instantly see if your input is correct (right numbers are green, wrong are red). This does not show you the solution, just whether you're on the right track.
  • Show Solution: Reveal the completed puzzle if you get stuck. This will show you whether your inputs are correct or not and show the blank cells.