Image: Sudoku (18 clue symmetrical)
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Description: "Raphael" - An 18-clue Sudoku with orthogonal symmetry by Rico Alan.
Title: Sudoku (18 clue symmetrical)
Credit: Own work. Puzzle: "Raphael - 18 Clue Symmetrical". Posted by Rico Alan, November 13, 2008, and attributed to Vic Reinhart.
Author: LithiumFlash
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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