BlueSudoku

BlueSudoku (Blue Sudoku) — the Sudoku experience you've been looking for.

No pop-up ads. No forced video ads. No interruptions. Just a clean, elegant Sudoku puzzle with a single non-intrusive
banner at the bottom.

🧩 5 DIFFICULTY LEVELS
From Easy to Evil — difficulty is determined by the solving techniques required, not just the number of clues.
• Easy: Naked singles only
• Medium: Hidden singles
• Hard: Naked pairs, pointing pairs
• Expert: X-Wing, Swordfish
• Evil: Advanced chains and coloring techniques

✏️ SMART FEATURES
• Pencil marks — toggle note mode to track candidate numbers
• Auto-clean notes — automatically removes candidates when you place a number
• Error highlighting — optional real-time mistake detection
• Undo — go back up to 50 moves
• Hints — daily free hints to help when you're stuck

⏱️ TRACK YOUR PROGRESS
• Statistics per difficulty level
• Best time and average time
• Completion rate
• Current and longest winning streaks

🎨 9 COLOR PALETTES
• Make it yours — from Midnight Amber to Sakura, Ocean, Lavender and more
• True-black AMOLED theme — battery-friendly on OLED screens

🌙 DESIGNED FOR COMFORT
• Light and dark mode support
• Clean, minimal interface with soft colors
• Haptic feedback for a tactile experience
• Smooth animations throughout

🔒 PRIVACY FIRST
• Plays offline — no account required
• Your progress and settings stay on your device

Built with care by BlueLogic Software.

Recent changes:
Bug fixes and infrastructure improvements.