11:22

dxSudoku #33 Remote Pair Puzzle Solving Technique

14:01

dxSudoku #29 Empty Rectangle Puzzle Solving Technique

13:51

dxSudoku #35 XY-Wing Puzzle Solving Technique

13:26

Remote Pairs Sudoku Chain Strategy

10:21

dxSudoku #69 Jellyfish Puzzle Solving Technique

31:39

The Even MORE Powerful XY-Chain! / Sudoku Tutorial #28

10:18

Tutorial #68 Strong and Weak links and Open Ended Chains, which enable you to remove small numbers.

9:44

W-W-What's a W Wing?!! Discover this SIMPLE yet Powerful strategy for Hard puzzles