Experience daily global Sudoku competitions! This app offers five unique Sudoku variations: Classic Sudoku, Comparison Sudoku, Killer Sudoku, Calculation Sudoku, and Symbol Sudoku. Enjoy unlimited puzzles, playable for a lifetime, with adjustable difficulty levels (five levels available).

Key Features:

• Five Sudoku Types: Classic, Comparison, Killer, Calculation, and Symbol Sudoku.
• Daily Sudoku Challenges: Compete with players worldwide daily on the same puzzles.
• Unlimited Puzzles: A vast library of puzzles ensures endless gameplay.
• Adjustable Difficulty: Choose from five difficulty levels.
• Autosave: Your progress is automatically saved, allowing you to resume where you left off.
• Candidate Number Memo: Enter potential numbers into cells for easier solving.
• Unlimited Undo/Redo: Easily revert or replay moves.
• Unlimited Bookmarks: Save multiple game states for later.
• Multilingual Support: Available in English, Korean, Japanese, and two Chinese variations.
• Hint Function: Get assistance on challenging cells.
• Duplicate Number Highlighting: Duplicate numbers are clearly marked for quick identification.
• Retina Display Support: Enjoy crisp, clear visuals on Retina displays.
• Memo Mode: Activate memo mode with a double-tap.
• Color-Coded Comparison: Cells requiring number comparison are color-coded for clarity.
• Customizable Settings: Control sound effects and language preferences.
• Feedback Function: Report bugs or share your thoughts with the developer.