I found this on

www.sudokufun.com - I used the print function to get a hard copy, and there is no category or any other identification.

If there is a category, I wish I knew how to find out. What are the choices of categories?

After about 20 hours, I went back to work on this, and I found that I had missed 2 "easy" 6's, in box 2 (as you pointed out), which leads to another in box 5. I now have:

*** *** 5*9

1*5 2** *68

78* *56 *2*

**6 *** 8*7

*2* 1*8 *56

5*8 *6* 2**

*4* 93* *85

85* 6*7 9*4

9** *** **2

I haved solved this by trial and error, so I have "the" answer. This is how I discovered I had missed the two "easy" 6's.

I have put the pencil numbers in every square. I am trying hard to see how this can be solved using logic, and I still cannot do it.

Once again, any help will be much appreciated.