Sudoku Puzzle Game Online Free – 3 Difficulty Levels | UpTools

Sudoku Puzzle Game Online Free – 3 Difficulty LevelsPlay Sudoku online with easy, medium, or hard puzzles — pencil marks, hints, timer, and mistake tracking in a clean browser experience.How it works

Choose a difficulty and press New Game.

Click a cell to select it, then press a number (1-9) to fill it.

Toggle pencil mode to add candidate notes.

Use hints or the eraser if you get stuck.

Fill the entire grid correctly to win!

FAQ

How do pencil marks work?

Toggle pencil mode (or press P) then press a number to add/remove a small candidate note in the cell.

What do the difficulties mean?

Easy: 36 cells removed. Medium: 46. Hard: 54. All puzzles are guaranteed to have a unique solution.

Can I use keyboard?

Yes — arrow keys to navigate, 1-9 to place, Backspace to erase, P for pencil mode.

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