Sudoku — Classic Number Logic

Sudoku is the timeless number puzzle that sharpens your logic, memory and focus. Place the digits 1 to 9 and enjoy pure, relaxing brain training. Every board is built by our generator and has one unique solution — no guessing, no dead ends.

Features:
• Three difficulty levels — Easy, Medium and Hard
• Puzzle generator with a guaranteed unique solution
• Pencil notes mode to jot down candidates
• Hint button for when you get stuck
• Mistake counter — three strikes and the game ends
• Timer and best-time records saved on your device
• Clean dark theme that's easy on the eyes
• Number pad with remaining-count badges
• Interface in English, Russian and Spanish, set automatically by your device language

How to play:
Fill the 9×9 grid so every row, every column and every 3×3 box contains the numbers 1 to 9 with no repeats. Tap a cell, enter a number, or switch to notes to mark the possibilities.

Why you'll love it:
• 100% offline — play with no internet on a plane, train or anywhere
• Completely free, with no ads and no in-app purchases
• No registration and no sign-in
• No data collection and no permissions requested

Download Sudoku and enjoy the classic logic puzzle whenever you like — perfect for a quick mental warm-up or a long evening of numbers. 🧩