Sudoku Classic – Number Puzzle

Sudoku Classic — the cleanest brain puzzle you can play with numbers.

No sign-up, no hassle — just start playing. With 4 difficulty levels from Easy to Expert and a fresh Daily Challenge every day, there's always a round waiting to wake up your brain. Ads are kept to a minimum, and you can play offline anytime — no internet needed.

[Key Features]

• 4 difficulty levels: Easy / Medium / Hard / Expert
• Daily Challenge: a new puzzle every day — build your streak
• Notes mode: pencil in candidate numbers and solve with pure logic
• Undo / redo / erase to fix mistakes freely
• Hints to give you a nudge when you're stuck
• Same-number highlight, related-cell highlight, and mistake indicators for comfortable solving
• Statistics: win rate, best time, average time, and streaks at a glance
• Dark mode support that's easy on your eyes
• Auto-save: pause anytime and pick up right where you left off

On the subway, at a café, before bed — fill your spare minutes the smart way.