Description: This sudokuSolver can solve sudoku's logical and guess numbers until its logical solvable.
Functions:
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Solve logical: If there is only one candidate for the selected place, add that number in the selected place.
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Solve guessing: If its not logical solvable, guess one of the candidates in the selected place, then repeat step 1.
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Create random: Create unique logical sudoku.
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Create quessing sudoku: Create sudoku that is not logical solvable.
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Predifined sudoku: Select one of the prefined sudokus, the options are: logical, guessing, guessing hardest and empty.
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Input level: Locked: No user input allowed. Half-locked: No user input on predifined numbers allowed. Free: All spaces are free to edit.