Heres a link to a pretty cool site with a new Sudoku game daily. (i think someone had a thread quite a while ago about it, hope its ok to bring it back, thought it was a cool game)
http://www.sudokucraving.com/game.php
Ive heard about it, but never played it before. First try, got it in 12:43, probably not too quick. Funny the things you find when you should be studying

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Gang Bang Tube