Sudoku Glow
Pure, relaxing number logic on a crisp newspaper-style puzzle page. Every puzzle is freshly generated and checked by a solver, so each one has exactly one solution and can be cracked with clear thinking, never guesswork luck.
Choose Easy for a gentle warm-up, Medium for a classic coffee-break chall
Sudoku Glow offers pure, relaxing number logic on a crisp newspaper-style puzzle page. Every puzzle is freshly generated and checked by a solver, so each one has exactly one solution and can be cracked with clear thinking instead of lucky guesses. It is a calm, focused way to give your brain a workout.
Choose Easy for a gentle warm-up, Medium for a classic coffee-break challenge, Hard for puzzles that need smarter techniques or Expert when you want a real test. Pencil notes let you track candidates, and row, column, box and matching-digit highlighting make patterns easy to spot. A wrong number turns red and counts as a mistake, and three mistakes end the puzzle, so careful logic pays off. You also get undo and three hints per puzzle when you are stuck. Your progress is saved automatically, so you can close the game and continue later.
This free online sudoku game is perfect for puzzle lovers of every level, with tap controls and a number pad on mobile plus full keyboard support on desktop. Best times are tracked for each difficulty, and Medium solves are ranked by time on the leaderboard. Tip: scan for rows, columns or boxes that are missing only one or two digits, then use notes to rule out the rest.
How to play
Fill every empty cell so each row, column and 3x3 box contains the digits 1 to 9 exactly once. Select a cell and tap a number on the pad or type 1-9. Turn on Notes (N or Shift plus a number) to pencil in candidates. Wrong numbers count as mistakes, and three mistakes end the run. You get three hints (H) per puzzle, plus undo (U). Complete the grid to win; Medium solves are ranked by time.
Controls
- Click / tap: Select a cell or press a pad button
- 1-9: Place a number
- Shift + 1-9 / N: Pencil notes
- Arrows / WASD: Move the selection
- Backspace / 0: Erase
- U / Ctrl+Z: Undo
- H: Hint
- P / Esc: Pause
Category: Puzzle games
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