31:50

Tutorial #80 A difficult sudoku puzzle made easy

14:03

This AMAZING Trick Can Solve Extreme Sudoku

29:43

Sudoku Tutorial # 88 The many tricks for Matching Pairs.

6:08

A Sudoku Secret to Blow Your Mind - Numberphile

31:15

Sudoku Tutorial #98 The power of triplets and matching pairs.

40:01

Sudoku Tutorial #97 a puzzle for all levels. Includes finned X wing.

26:02

Tutorial #87. Beginners Delight. A difficult puzzle made easy

27:03

Solve a HARD Level Sudoku the EASY way! X wing, W wing, XY wing, and even a BUG +1