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 no...