Beginner Guide: How to solve Super Fiendish sudoku: 18 Jan 18 - YouTube
The Times Super Fiendish Su Doku Book 1: 200 challenging puzzles from The Times
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Hard to Extreme Sudoku - 300 Challenging Puzzles - Volume 2: Super Fiendish Sudoku Puzzle Book for Advanced Players: BrainWhale: 9798709295247: Books - Amazon.ca
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