Hello Everyone,
Wish you a Merry Christmas and Happy Holidays.

For the lovers of speed i.e easy Sudoku puzzles and mind bending hard puzzles try
www.mindoku.com/games

It contains varieties of puzzle ranging from 6x6 easy to 9x9 irregular difficult.

Can you beat world's best time or record time of Sudoku at mindoku

Sudoku Time Player
6x6 Easy 06.499 s dp_94 (INDIA)
9X9 Easy 25.598 s Tim (FRANCE)
9X9 V.DIFF 59.294 s jaku111 (Czech Republic)
9x9 Dig DIFF 56.560 s TiiT (Estonia)
6X6 Irr Easy 08.822 s Krubi (Estonia)

and many records see www.mindoku.com/games/sudoku/records?sudoku_type=2&difficulty=4
Exact timings can be seen here http://www.vint.ee/sudoku-rekordid/

below are some video stuff which I found on Youtube

https://www.youtube.com/watch?v=GB9HDnINGpg
https://www.youtube.com/watch?v=dN9X47Vt_cg