Sudoku Zen

Sudoku Zen is a free online puzzle game you can play right here in your browser — no download, no sign-up. Relaxing number placement puzzle.

How to play Sudoku Zen: Relaxing number placement puzzle.

Controls: Click or tap tiles and pieces to select and place them; some puzzles also support dragging or the Arrow Keys to nudge the board.

Strategy: Puzzle games reward planning over speed. Scan the whole board before your first move, work from the constraints that have the fewest options, and undo mentally before you commit.

Tip: When you are stuck, clear the edges or corners first — they usually have the fewest valid solutions and unlock the middle. Use the “Fullscreen” button for the best experience.