How to Play?

Step by step:

Setp 1: Choose the type of the game, then click "OK"

Step2:

There is only one rule: Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 thru 9.

A column is 9 cells tall. A filled-in column has 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.

               
    A box contains 9 cells in a 3x3 layout. It works the same as a column.

A row is 9 cells wide. It works the same as a colum

There is no math involved. Nothing has to add up to anything else. You solve the puzzle with logic and reasoning.

Click one of the digit bar "1"-"9" or press the keyboard "1"-"9", then click a blank grid you want to fill digit. If you fill a wrong digit, show the red digit. Fill a right digit , show the blue digit. You can click "Hint", then click the grid. Or stick to "Shift" click a blank grid help you fill the grid. Clear a digit grid, click "clear", then click the grid. Or stick to "Ctrl" click a blank grid.

That's enough to get you solving very easy and easy puzzles. You are bound to discover the techniques, on your own.
Let the brain teasing begin!

Step 3: When you fill all the grid right. Congratulate!!! you win the game!!!