Solve this puzzle! (hard)

[GameSnake]

From the authors website:

"Below is a very special grid, around each shaded number are 8 white squares. However, each white square should have a number from 1 to 7. Once filled in, these 8 numbers will sum to the shaded number. In addition, once completed correctly, no row nor column will contain a duplicate number within a white square. For example, the top row may be 5 6 4 2 3 1 7, etc. This is [site name removed] most difficult puzzle, but is solvable without the aid of a computer"

[GameSnake]

This is a rather hard puzzle..

[BigAznDaddy]

i dont get how the sum of the numbers can be all 3 of the numbers

scrach my head

[Ergot]

Dumbass.

[GameSnake]

Dumbass.

Enlighten us.

[Ergot]

Dumbass.

Enlighten us.

I understand the concept, I don't know the numbers as I don't want to try.

[Nate]

2 1 3 5 6 4 7
6    5    3    1
1 2 6 3 4 7 5
4    2    7    6
3 6 7 2 5 1 4
5    4    1    2
7 5 1 4 2 6 3

[GameSnake]

2 1 3 5 6 4 7
6    5    3    1
1 2 6 3 4 7 5
4    2    7    6
3 6 7 2 5 1 4
5    4    1    2
7 5 1 4 2 6 3

How would I evn confirm if this is right?

[Explicit]

2 1 3 5 6 4 7
6 5 3 1
1 2 6 3 4 7 5
4 2 7 6
3 6 7 2 5 1 4
5 4 1 2
7 5 1 4 2 6 3

How would I evn confirm if this is right?

By following the rules that govern this puzzle, how else?

It looks correct to me, though.

[Newby]

2 1 3 5 6 4 7
6    5    3    1
1 2 6 3 4 7 5
4    2    7    6
3 6 7 2 5 1 4
5    4    1    2
7 5 1 4 2 6 3

http://www.brainbashers.com/showpuzzles.asp?puzzle=ZIWB

[BigAznDaddy]

i still dont get it >:(

[Blaze]

Why the hell would you remove the sites name, but not rephrase the question? I wonder where it came from...

[GameSnake]

He coulda cheated by looking at this.

[Blaze]

What I'm saying is he could have cheated either way!  It's just as easy.

[BigAznDaddy]

i think sodoku is way eazier
but i still dont get this