Click the "Easy" button to start a new game, move up the ladder when your solving skill gets better.

Fill the blank with a number from 1 thru 9.

Rules to complete the game successfully includes:

1. No duplicate number in all vertical columns

2. No duplicate numbers in all horizontal rows

3. No duplicate number within 3x3 lattices

Click the "one step" button at bottom right to get a clue and "all" button to show complete result.

Check the "show candidates" box to view the viable number combinations in each blank cell

when you reach and be good at the "very hard" level, game, let Mike know, he will give you a separate certification test to validate your mighty skill.

Afterwards, you will be promoted to the Killer Sudoku expert level games!