Bi Sudoku — the world's most loved number puzzle, beautifully redesigned for iOS. Whether you're a beginner or a Sudoku master, enjoy thousands of handcrafted puzzles with smart hints that actually teach you how to solve. CLASSIC SUDOKU & BEYOND Play the classic 9x9 Sudoku you know and love, plus exciting variants: - Mini Sudoku (4x4) — Perfect for quick sessions - Diagonal Sudoku — Extra diagonal constraints - Killer Sudoku — Sum-based cages for advanced players - Color Sudoku — A colorful twist on the classic MULTIPLE DIFFICULTY LEVELS - Easy — Great for beginners - Medium — The perfect daily brain workout - Hard — Test your logical thinking - Expert — Only for true masters SMART HINT SYSTEM Our hints don't just give you the answer — they explain the logic: - Learn why each number goes where it does - Master techniques: Naked Singles, Hidden Pairs, Pointing Pairs - Improve your skills with every game DAILY CHALLENGES & STREAKS - A fresh puzzle every single day - Build your daily streak and earn rewards - Track your progress on the calendar view 6 GAME MODES - Classic — Standard Sudoku gameplay - Zen Mode — No timer, no pressure, pure relaxation - Time Attack — Race against the clock - No Mistakes — One wrong move, game over - Survival — Progressive difficulty - Challenge — Special objectives DETAILED STATISTICS - Games played, solved, and win rate - Best and average completion times - Streak tracking and difficulty distribution - Hint and mistake statistics ACHIEVEMENTS & LEADERBOARDS - 15+ achievements to unlock - Compete on global leaderboards - Compare best times across all difficulties POLISHED GAMEPLAY - Pencil Mode for candidate notes - Unlimited Undo & Redo - Auto-erase invalid notes - Smart highlighting - Mistake detection - Auto-save your progress BEAUTIFUL THEMES - Light & Dark themes - Neon and Minimal themes - Earn coins to unlock exclusives 15 LANGUAGES English, Turkish, Arabic, German, Spanish, French, Hindi, Hebrew, Indonesian, Japanese, Korean, Malay, Portuguese, Russian, Chinese WORKS OFFLINE Play anytime, anywhere — no internet needed. PREMIUM OPTION - Remove all ads - Unlimited hints - Exclusive themes Download now and join millions of Sudoku players worldwide!