Sudoku ∗

This sudoku gives you sudoku books. Your books have names and your sudokus inside are numbered, so you can easily refer to them and exchange your experiences with your friends. Solve your sudokus in any order and switch between sudokus of different books anytime. But wait, there is more, much more: + Solve whole sudoku books from gentle to diabolic (books are added regularly) + Draw numbers with Apple Pencil and your finger (optional) + Solve your sudokus partially and finish them later + Add notes (possible numbers) to empty squares + Auto-disable completed numbers + Auto-delete notes that are no longer needed + Use hints for unknown squares + Cancel sudokus to see the solution + Highlight identical numbers + Record your play time (time can be hidden) + Record your game score (score can be hidden) + Record hints used while solving + Record errors made while solving + Analyze your game statistics...