classic sudoku: number puzzle

Sudoku is a classic logic puzzle game.
It is simple and easy to play, but hard to be master. Train your brain with Sudoku now!

Special Feature:
• 6 difficulties: easy, medium, hard, very hard, crazy and inhumane
• Thousands of brain training sudoku puzzles
• Eliminate mistakes made in the past
• Undo moves
• Get hints when you get stuck
• Historical statistics

Have fun!