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Sudoku
by Nebulark Studio · Puzzle · v1.1.0
Fill a porcelain-blue 9×9 grid so every row, column and box holds 1 to 9. A fresh puzzle with exactly one solution, every time.
How to play
- Fill the grid so every row, column and 3×3 box holds 1 to 9 exactly once.
- Pick Easy, Medium, Hard or Zen and press Play.
- Select a cell by clicking or tapping it, or with the arrow keys, then type 1–9 or tap the number pad.
- A wrong digit turns red and costs a heart. Lose all three and the run ends.
- Press N or the Notes button to pencil in candidates. Backspace or Erase removes a wrong digit.
- Stuck? Press H or Hint to fill a cell: three per ranked run, each adds 20 seconds. Zen hints are free.
- Fill the whole grid to finish. Your time is your score, and lower is better. Leave mid-puzzle and Continue later.
Controls
Keyboard
- Click a cell or use the arrows — select
- 1–9 — enter a digit
- Shift + 1–9 — toggle a pencil note
- N — notes mode on/off
- H — hint (fills a cell, +20 s)
- Backspace / Delete / 0 — erase
- ? — how to play
- Esc — pause
- M — mute
Touch
- Tap a cell — select
- Tap a digit on the pad — enter it
- Notes button — pencil marks on/off
- Erase button — remove a wrong digit or notes
- Hint button — fill a cell (+20 s; free in Zen)
- ? button — how to play
About Sudoku
Sudoku lays a classic number-place puzzle on a white glazed tile with cobalt lines. Every puzzle is built fresh by a seeded generator and checked by a solver, so it always has exactly one solution: Easy (40 givens) can always be cracked with singles, Medium has 32 givens and Hard 26, with puzzles that need more than singles. Select a cell and type a digit or tap the number pad; keep pencil notes, which tidy themselves when you place a digit. Your selection lights up its row, column and box and every matching digit, conflicts turn red, and each finished row, column and box glows soft gold. In ranked play you have three hearts: a wrong digit costs one. Stuck? Three hints per run fill a cell for a 20-second penalty. Prefer to take it slow? Zen mode has no hearts and no clock. Your solve time is your score. Leave mid-puzzle and Continue later, right where you left off.
Features
- ✓ Seeded generator: a fresh puzzle with exactly one solution every game
- ✓ Easy rated by a singles-only solver; Hard needs more than singles
- ✓ Three hearts per ranked run, plus an unhurried Zen mode
- ✓ Three hints per run (+20 s each), free and unlimited in Zen
- ✓ Pencil notes that tidy themselves when you place a digit
- ✓ Row, column, box and same-digit highlights, red conflicts, gold completed units
- ✓ Lit porcelain tiles: raised digits, sunken empty cells, a pressable number pad
- ✓ Auto-save: leave mid-puzzle and Continue exactly where you were
- ✓ Keyboard, mouse and touch number pad; validated time leaderboard per difficulty
- Category
- Puzzle
- Devices
- desktop, tablet, mobile
- Developer
- Nebulark Studio
- Last updated
- Nov 10, 2026
