Sudoku-ClassicSudokuPuzzle game is a popular and addictive brain Sudoku puzzle game. More than 1200+ challenging Sudoku puzzles, suitable for beginners and advanced players' brain Sudoku! Suitable for all ages Sudoku-ClassicSudokuPuzzle There are 4 difficulty levels-Simple Sudoku, Medium Sudoku, Hard Sudoku and Expert Sudoku! Suitable for Sudoku beginners and advanced players! Pencil mode-Turn on/off the pencil mode as needed. Highlight repetition-Avoid repeating numbers in rows, columns, and blocks. Smart