Features:

❤️ Sudoku - Classic Sudoku Puzzle have four levels of difficulty - simple, medium, difficult and expert, which are very suitable for sudoku beginners and advanced players
💛 Daily Challenge - Complete the daily challenge and collect trophies
🧡 Pencil mode - turn pencil mode on/off as required
💚Highlight Duplicates - Avoid repeating numbers in rows, columns, and blocks
💙Smart tips - guide you to complete the numbers when you encounter difficulties
💜Theme - choose a theme that makes your eyes easier

On this Sudoku - Classic Sudoku Puzzle, you can also
❤️Turn sound effect on/off
💛 Turn on/off highlighting the same number
🧡Automatically delete comments from all columns, rows, and blocks after placing numbers
💚 Unlimited Undo and Redo
💙 Auto save - pause the game and continue the game without losing any progress