To solve X-Sums Sudoku, first look at the minimum and maximum outside clues. For example, if 1 is given outside, one can immediately put 1 in the first cell. Similarly if 45 is given outside then one can immediately put digit 9 in the first cell. Similarly if 3 as outside hint then one can put 2 in the first cell and 1 in the next cell to make the sum as 3. Also if 44/43 is given one can immediately put 8/7 in the first cell and 1/2 in the opposite edge first cell.

Another thing to checkout in X-Sums Sudoku is that if the sum of opposite edge given numbers is 45 then sum of digits in the first cells of opposite ends will be 9.

__Rules of Jigsaw X-Sums Sudoku__
Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and outlined region. Each outlined region is marked by thick borders.Additionally the clues outside the grid indicate the sum of the first X numbers placed in the corresponding direction, where X is equal to the first number placed in that direction.

### Jigsaw X-Sums Sudoku Puzzles (DSL #203, FWS #258)

### Jigsaw X-Sums Sudoku Puzzle (Daily Sudoku League #199)

### Jigsaw X-Sums Sudoku Puzzle (Daily Sudoku League #184)

__Rules of X-Sums Sudoku__
Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and outlined 3x3 region. Additionally the clues outside the grid indicate the sum of the first X numbers placed in the corresponding direction, where X is equal to the first number placed in that direction.

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