Sudoku

Sudoku by M1903 Labs - pure puzzle. Nothing else.

No sign-ups. No ads. No tracking. No cloud. Just Sudoku, the way it should be -
clean, focused, and entirely yours.

Every puzzle is freshly generated the moment you start a game. No puzzle bank,
no repeats, no internet required. Whether you're on a plane or off the grid,
your game is always ready.

━━━ FOUR DIFFICULTY LEVELS ━━━

🟢 Easy - Generous clues, perfect for warming up or winding down.
🟡 Medium - The sweet spot. Enough challenge to keep you thinking.
🔴 Hard - Fewer clues, limited mistakes allowed. Focus required.
💀 Nightmare - For those who genuinely enjoy suffering. Good luck.

Hard and Nightmare enforce a 3-mistake limit - run out, and the game ends.
Easy and Medium let you play freely with no penalty for errors.

━━━ FEATURES ━━━

✏️ Notes mode - Tap the pencil to toggle note-taking. Tap any digit to
add or remove it as a pencil mark in the selected cell.

💡 Hints - Stuck? Reveal a cell. Hints are limited per difficulty, so
use them wisely.

↩ Undo - Made a move you regret? Step back as many times as you need.

⏸ Pause - Need a break? Pause hides the board so no one gets a free look.

🎨 Themes - Light and dark modes, with full system theme support.

📳 Haptic feedback - Subtle vibrations on placements, errors, and wins.

🔊 Sound effects - Optional audio cues for taps, mistakes, hints, and
game outcomes. Off by default.

━━━ RICH STATISTICS ━━━

Track your progress across every difficulty:
• Games played, won, lost, and abandoned
• Win rate and current win streak
• Best time and average completion time
• Total hints used and total mistakes made
• All-time totals across all difficulties

Your stats live only on your device. Always.

━━━ PRIVACY, BY DESIGN ━━━

M1903 Labs is proud to build software that respects you. Sudoku collects
absolutely no data - no analytics, no crash reporting, no ad identifiers,
nothing. There is no server. There is no account. Your games, your stats,
and your preferences exist only on your phone.

We don't know you played. We don't want to.

━━━ NO INTERNET REQUIRED ━━━

Fully offline. Every feature works without a network connection - puzzles
are generated on-device at runtime using a procedural algorithm.

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M1903 Labs LLC · Built with care · Zero data collected