Two sudoku puzzles were printed in the school news paper. I found the easy one to be just that, easy. The hard one seems impossible. I wrote down all the possible numbers that could go in each empty square. I even figured out a few things that were obvious, but it still left two possibilities. I've tested situations out where there were two possibilities hoping to find a confound. It didn't work. I eventually just gave up and looked at the answer. Anyway, I was hoping someone on here could demonstrate a proof that would result in progress from where I got stuck. Asteriks represent blanks.

**9 *3* ***

5*6 **8 ***

**7 *4* 61*

7*2 **4 *8*

9*3 *8* 4*7

*84 7** ***

*71 869 3**

*95 4** 8*6

**8 *5* 9*1

All of the numbers above were compared to the answer printed in the paper, and they are correct. Some of them were given and some of them I had no trouble figuring out. If you notice, there's only one 2 up there, and it was one that I ended up figuring out. I realized early on that this one was hard because a 2 could possibly be anywhere from the start.