W-W-What's a W Wing?!! Discover this SIMPLE yet Powerful strategy for Hard puzzles
13:34
What is so UNIQUE about the Unique Rectangle?
15:05
This Sudoku Trick Can Solve VERY Hard Puzzles – SHC 280
27:03
Solve a HARD Level Sudoku the EASY way! X wing, W wing, XY wing, and even a BUG +1
23:43
Three Diabolical Sudoku Techniques
13:26
Remote Pairs Sudoku Chain Strategy
16:44
Lots of TRIPLES! Useful Sudoku Strategy - Great for Beginners to Know
15:33
'Hard' sudoku made easy - with this simple method
16:12