Sudoku - Online Multiplayer

Think you can solve Sudoku faster than your friends? Now you can
prove it.

Sudoku - Online Multiplayer brings the classic number puzzle into
real-time head-to-head competition. Share a 6-digit room code,
wait a second for your opponent to join, and race to complete the
same puzzle first — no login, no account, no friction.

── HOW MULTIPLAYER WORKS ────────────────────

1. Tap "Create Game" and pick a difficulty.
2. Share the 6-digit room code with your friend.
3. Your friend taps "Join Game" and enters the code.
4. Both of you start on the identical puzzle at the same moment.
5. The first player to fill every cell correctly wins.

Live progress bars show how far ahead (or behind) your opponent
is as you both solve. If your opponent quits, you win immediately.

── SMART GAMEPLAY ─────────────────────────

• Auto-fill — when only one cell is left empty in a row, column,
or box and everything else is correctly filled, the app
highlights that cell green and fills it for you after a brief
pause. Chains of obvious cells are handled one by one.

• Auto-erase — wrong entries are highlighted in red and erased
automatically after 1.5 seconds so you can try again without
tapping a separate button.

• Digit counter — each number key shows how many times that digit
still needs to appear. When it reaches zero, the key dims.

• Cell highlighting — selecting a cell highlights its entire row,
column, and 3×3 box so you can spot conflicts at a glance.
(Can be turned off in Settings.)

── THREE DIFFICULTY LEVELS ────────────────

• Easy — 36 given cells. Great for warm-ups or beginners.
• Medium — 30 given cells. A satisfying challenge for most.
• Hard — 24 given cells. Demands real Sudoku skill.

Both solo and multiplayer games respect your chosen difficulty.

── PLAY OFFLINE TOO ───────────────────────

No internet? Tap "Play Offline" for unlimited solo practice. All
smart gameplay features (auto-fill, auto-erase, highlighting)
work exactly the same, with a timer and mistake counter so you
can track your personal best.

── CLEAN, DISTRACTION-FREE DESIGN ─────────────

The dark navy and gold UI keeps the focus entirely on the puzzle.
There are no unnecessary menus, no cluttered toolbars, and no
forced tutorial. Pick up and play in seconds.

── REMOVE ADS — ONE-TIME PURCHASE ───────────

The free version shows banner and interstitial ads. A single
in-app purchase removes every ad permanently — across devices,
reinstalls, and updates. Your purchase is tied to your Google
Play account and can be restored at any time from Settings.

── PRIVACY ─────────────────────────────

Multiplayer uses anonymous Firebase authentication — no email,
no password, no personal data collected. Room codes expire when
the game ends. See our Privacy Policy for full details.

Recent changes:
• Real-time 1v1 multiplayer via 6-digit room codes
• Three difficulty levels: Easy, Medium, Hard
• Smart auto-fill for obvious cells
• Wrong entries auto-erase after 1.5 s
• Live opponent progress bar
• Offline solo practice mode — no internet required
• One-time Remove Ads in-app purchase
• 1 free hint every solo game, more by watching a short ad
• Both players always get the same puzzle in multiplayer