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 tips-guide you through the numbers when you encounter difficulties. Undo-return to the last operation. Theme-Choose a theme that makes your eyes easier Use dark mode to protect your eyes. Sudoku, Sudoku game, brain training, logic puzzle, number puzzle, puzzle game, classic sudoku, difficulty levels, pencil mode, smart tips, undo, dark mode, stress relief, cognitive skills, mental workout, 1 to 9 digits, rows, columns, blocks, all ages, free puzzle game