Sudoku

Teaser: 
Help: 
Place the tiles such that all rows contain 1-9, all columns contain 1-9, all boxs contain 1-9. Click help to show any mistakes. Undo or the blank tile can be used to made fixes. Press solve if the puzzle is too challenging.
Explanation: 
Fully playable version of sudoku made over a week. This was created using As3. Will add more if there is any interest. Please comment on this version of a popular game. See how many puzzles you can complete without hitting solve!

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