About Sudoku Checker's difficulty calculation: +10
When you make your own sudoku, the tool to verify its correctness will display the "degree of difficulty of the question".
This calculation method was originally devised.
For example, when it is blank like a photo
The degree of difficulty is as follows.
- "The four cells on the right side of the upper row" are blank
- "The upper three cells in the right column" are blank
- "One of nine places on the upper right" is blank
When the above mentioned ...
- The number of difficulty: 16 will be.
There are six cells (+6) that can be easily judged from other numbers, and one place (+10) where a little ingenious judgment is required: "6 + 10 = 16"
This "Sudoku Checker" can be installed on iPhone / iPad for free.
Download from the App Store 
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