Sudoku Zenkai is a game for beginners and advanced Sudoku players.
It lets you play cooperatively with your friends! You can start a new puzzle with a friend or simply ask one to help you on that tricky one, two heads are always better than one (usually).

Train your brain, logic and perception skills with Sudoku Zenkai puzzles in six different difficulties so that you can start on trainee levels to exercise your logical thinking and memory, or just jump to the insane levels to give your mind a real workout.