Análisis de la app SudokuFriend para 9 de diciembre

[Sudoku : number place] It is an application that allows you to enjoy the sudoku puzzle on the go by easily entering the sudoku puzzle published in the magazine. It has the following functions ・Save and load function ・You can write down the number under consideration ・Rewind operation with UNDO function This app has no original question. We are also considering delivering the original question in update.