Again Sudoku Scan & Solve Pro

Well known Sudoku game. Different levels/skills with 3x3 (standard) and 2x2 small layouts.
You may solve Sudoku automatically with a double tap on the 'play' button.
Further this version allows scanning printed Sudoku ('scan' button).
Camera itself and 'camera access' permission are mandatory (obvious technical reasons) to enter the scan function.
Only back side camera may be used for scan. An appropriate resolution is required.
Optionally 'storage write' permission is required to save a scanned picture (user defined option, initially set off).
Sudoku clues may now be edited manually.
The game boards may be optionally stored as images if double tapping 'export' button ('storage write' permission will be asked).
Store location: 'zeSudokuScan' subfolder of the common photography folder.
Further 'external storage read' permission is required to load images for Sudoku optical recognition.
Loading images is an optional functionality.
No network access/connection is necessary, no user data is accessed.
Hint: Stored pictures (i.e. scans) may be accessed from other applications if the store option is enabled.
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