At the Daily League that was started on Facebook, today we have the Arrow Sudoku by Bastien V J.
Each row, column and region must contain the digits from 1 to 9.
Within an arrow, the digit in the circled cell is equal to the sum of the digits on the rest of the arrow.
Clicking on this link will take you to Bastien's blog where the image is hosted along with some other world class sudokus.
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