Rules: Standard Sudoku rules (insert a number in the indicated range into each cell so that no number repeats in any row, column, or bold region). Some arrow shapes are in the grid; the sum of the digits along the path of each arrow must equal the digit in the circled cell. Digits can repeat within an arrow shape.
Answer String: Enter the row/column marked “A”, followed by a comma, followed by the row/column marked “B”. Rows are entered from left to right and columns from top to bottom. This example has the key “351876294,617354928”.
(Brief) History of Arrow Sudoku: Descended from Sudoku and arithmetic puzzles. Arrow Sudoku is a Japanese nanpure variation, likely created before the return of “Sudoku” to the West. (If you know more about the original author/publication of this style, please tell us).
History of this example: This Arrow Sudoku was written by Thomas Snyder for the 2010 Hungarian Sudoku Championship.
Sources for Arrow Sudoku: Follow this link for Arrow Sudoku puzzles on this website. If you are new to this puzzle type, here are our easiest Arrow Sudoku to get started on. A few more Arrow Sudoku puzzles can be found in Sudoku Masterpieces, and more will appear in future titles by Grandmaster Puzzles.
Design rules for contributors: A Grandmaster Arrow Sudoku will have a unique solution that can be reached by logic alone. Generally, a Grandmaster Arrow Sudoku has a symmetric layout of numbers and arrows or a visually interesting theme that does not need symmetry. Arrows can exit and reenter the grid, and on rare occasions cross other arrows or circles provided it is clear what each component arrow is. Multiple arrows can arise from a single circle. Given numbers should not appear anywhere on the arrow shapes.