Sudoku (Medium-Difficulty Puzzle #8)

Difficulty: * * *   (explanation of difficulty)

Instructions: Fill each square with a number between 1 and 9, such that each row, each column, and each 3×3 box contains each digit between 1 and 9 exactly once. There is only one way to complete the puzzle correctly.

For immediate feedback as to whether your entries are correct, select "Yes" for "Provide immediate feedback for wrong answers". Select the "Check Solution" button when done.

6387
16
86739
72
18
94
65814
85
7432

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