Sudoku Duel is the classic logic puzzle, redesigned around two things you can't get from any other Sudoku app: a real-time 1v1 Battle Mode and a fresh Daily Challenge that everyone races on the same board.

⚔ BATTLE MODE
Generate a room code, share it with a friend in one tap, and race them on identical puzzles in real time. Watch their progress fill the bar opposite yours. First to a clean board wins. No accounts, no signups — just the link.

🗓 DAILY CHALLENGE
Every player gets the same puzzle each day. Beat it before midnight to keep your streak alive. Simple, addictive, and exactly the right size for your morning coffee.

🔥 WIN STREAKS
Solve at least one puzzle a day and your streak grows. Miss a day, it resets. The 7pm reminder is opt-in and stays on your device.

🧩 FOUR DIFFICULTY LEVELS
Easy, Medium, Hard, and Expert — each generated fresh, each guaranteed to have exactly one solution. No back-tracking dead ends. Ever.

⚡ TWO INPUT MODES
Lightning (number first, like the modern apps) or Classic (cell first). Switch any time from Settings.

✏️ THOUGHTFUL ASSISTANCE
Smart pencil marks that auto-dim when invalid. Optional error highlighting. Optional auto-removal of obsolete notes when you place a digit. Configure as much or as little help as you want.

🔒 PRIVACY-FIRST
No accounts. No tracking by default. iOS App Tracking Transparency is honoured. Delete every byte of your data with one tap from Settings. Privacy policy linked in-app.

📵 100% AD-FREE
v1 ships completely ad-free. No interstitials, no banners, no upsells. Just Sudoku.

Whether you're a daily-puzzle person or you've been waiting for a way to play head-to-head with a friend across the room (or across the world), Sudoku Duel is the cleanest way to do it.