Advance Techniques (Master Techniques)
- Technique 6 : X-Wing
- Technique 7 : Swordfish
- Technique 8 : Guess/Tips
- NOTE : Besides above there are few more techniques, but then it would make the sudoku more complicated then it looks. So keep open your eyes and first try to solve it with basic rules/principles. If you stuck up anywhere then try the dificuilt ones (with the help of pencil marks - for more clarity).
THERE ARE MANY MORE TECHNIQUES TO SOLVE IT BUT THE ABOVE SHOWN TECHNIQUES WILL BE HELPFUL WHILE SOLVING THE PUZZLES.
YOU WILL ENCOUNTER MANY TRICKS ON YOUR OWN WHILE SOLVING AFTER GAINING SOME EXPERIENCE.