Jigsaw Sudoku

This game is the same as sudoku, except that the small groups are in an irregular shape. The object of this game is to fill in all the squares with numbers 1 to 9, the numbers in a row or a column must not repeat, and also the numbers in a group must not repeat. The faster you finish the game, the higher your score. When you are stuck, you can use the hints, but you will be penalized.