Inner Frame Sudoku Puzzle (Fun With Sudoku #312)

Inner Frame Sudoku type is a very interesting Sudoku puzzle. I found it more interesting than the original Sudoku variation of this type called Frame Sudoku. This Inner Frame Sudoku Puzzle is appearing in the forthcoming 4th Round of the Sudoku Grand Prix 2018. I have created this Inner Frame Sudoku for the practice of this Sudoku competition and posted it so that readers of the Fun With Puzzles website can also use it as the practice of this Sudoku competition. I am submitting this Inner Frame Sudoku puzzle as part of the Fun With Sudoku Series as the 312th Sudoku Puzzle in this Series.

Rules of Inner Frame Sudoku Puzzle

Standard Sudoku Rules apply. Additionally, numbers outside Frame represent the sum of the 2nd 3rd, and 4th digits appearing in that direction.

Inner Frame Sudoku Puzzle (Fun With Sudoku #312)

The answer to this Inner Frame Sudoku puzzle can be viewed by clicking on the button. Please try your best to solve this Sudoku puzzle before looking at the answer.

This Inner Frame Sudoku Puzzle I am publishing as the #312th Sudoku puzzle in the Fun With Sudoku Series. Here are the next and previous Sudoku puzzles published in this series.

The previous Sudoku Puzzle is Search 9 Sudoku Puzzle (Fun With Sudoku #311)

The next Sudoku Puzzle is Fortress Sudoku Puzzle (Fun With Sudoku #313)