Sudoku is a puzzle that has swept the world. It is very fun to play, but can be tricky and confusing at first. The object is to put the numbers 1-9 in every row, column, and 3X3 square block.

Easy Level

1. Use logic to solve them. Since you already know that you can’t have the same number in any row, column, or nine-square block, you can use that to help you get a number. The difficulty depends on the placement of the numbers given to you.
2. When solving an easy Sudoku, the first thing you should do is look for definites. Definites are numbers that are definitely going to be there. Starting at 1, draw imaginary lines through boxes in that 1’s row and/or column. When there is only one box left in the 3×3 box, you know that is a definite. (see image one and two).
3. Work your way through the numbers until 9. Because you have filled in some numbers, this should help get other numbers that had more than one possibility before. (see image three and four. Notice how the 3s could not have been solved before, but are solved in the final).
4. If you get stuck, go back and make sure to look at everything. It is almost guaranteed you missed something. That one thing is usually all you need to get going again. If you still cannot find anything, start labeling every block with everything that could possibly go in that box. i.e. In image one, all the empty boxes have numbers that could possibly go there. Fill these in. If there is a 1 in the row or column of that box, you know 1 is not a possibility.
5. Start by doing Sudoku in the newspaper or online (see links below). The newspaper Sudokus are usually easier on Monday and Tuesday. The difficulty increases as the week passes.

Read about solving methods for Hard and Samurai levels here

This is an old idea of lines game implemented in a Flash applet. It means you can play it in your browser online.

The game - http://everybodypanic.org/linegame.htm