Thanks to all! It's my first game.
2 saber7: may be you just don't like sudoku? :) Anyway you may print it on a gray paper )
2 blobathor,RedHawk8: I like to solve sudoku and never writing notes. Train you memory :)
2 AndyLudendum: http://en.wikipedia.org/wiki/Sudoku - is it not sudoku? And I think many solutions is not bad, it's good! )