Christmas Sudoku

Long Description:

It is Christmas time folks & the benevolent Santa is out distributing mystery Christmas gifts, candies and chocolates. But this year, the Santa is acting very choosey - you are eligible for his gift only if you demonstrate that you actually deserve it !!! Welcome to the world of Christmas Sudoku - Santa's favorite puzzle game to test your gray cells !!! Based on the classic century old Japanese number puzzle, Christmas Sudoku brings a unique gaming experience on your mobile while it relives the glitter & festivities of the Christmas season with colorful graphics & eye-catching animations on the screen. Just follow logical thinking and your natural instincts - it involves no mathematics to solve this puzzle.
Its time now to prove your worth to the Santa - he is on the look-out for you intelligent ones !!! Embark on a solitary yet inclusive pursuit into the number world. 

How to Play?
The player has to fill the grid with numerical digits as per instructions below. The digits to be entered are 1,2,3,4,5,6,7,8,9.
This is a row, 9 cells wide. A filled-in row must have one of each digit. That means that each digit appears only once in the row. There are 9 rows in the grid, and the same applies to each of them.
This is a box, containing 9 cells in a 3x3 layout. A filled-in box must have one of each digit. That means that each digit appears only once in the box. There are 9 boxes in the grid, and the same applies to each of them.
This is a column, 9 cells tall. A filled-in column must have one of each digit. That means that each digit appears only once in the column. There are 9 columns in the grid, and the same applies to each of them.
You can't change the digits already provided in the grid, you have to work around them. Every puzzle has just one correct solution.

Screenshots: