A Sudoku Puzzle

A friend of mine, whom I am teaching Punjabi to, asked me to create a Sudoku puzzle.

So here is a link that explains how to create a Sudoku and here is an easy puzzle I created:

1	.	.	5	.	.	.	7	2
.	.	7	.	4	.	6	.	.
.	9	.	.	.	7	.	.	3
.	.	2	8	.	.	5	3	.
.	4	.	.	5	1	.	.	9
9	.	.	.	.	3	.	1	.
2	.	.	.	7	.	.	.	6
.	6	8	3	.	.	.	9	.
.	5	.	.	.	8	3	.	1

Here is a very difficult puzzle (created through a software):

3	1	9	7	.	.	.	.	.
.	.	6	.	.	2	.	.	.
.	5	.	.	.	.	.	.	.
.	2	5	.	.	9	.	8	3
.	6	.	.	7	.	.	1	.
9	8	.	3	.	.	6	2	.
.	.	.	.	.	.	.	6	.
.	.	.	1	.	.	3	.	.
.	.	.	.	.	7	9	5	8