1. ## Re: Grid 2

Rob

What are the rules?

Judging by the layout I am guessing each row & column must contain the numbers 1-9 and each of the highlighted 3X3 blocks must also contain the number 1-9

2. ## Grid 2

Due to overwhelming popular demand, here is another number grid puzzle. This one can be solved using reasoning as opposed to trial and error.

Complete the grid such that every row, every column, and the nine 3x3 blocks contain the digits from 1 to 9.

3. ## Re: Grid 2

Quite right, Tony. I have edited the post so that it makes sense.

Hans,

5. ## Re: Grid 2

Here is the hopefully correct version:

<table border=1> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td> <td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td> </table>

6. ## Re: Grid 2

Incorrect solution - see below

<table border=1><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">5</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">8</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">6</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">2</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">4</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">1</span hide></td><td align=center><span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">7</span hide></td></table>

7. ## Re: Grid 2

Rob

After your last Grid puzzle ( I was almost there until I found the last square didn't add up ...grrrrrr) I knew I could do this one

8. ## Re: Grid 2

Weii done, Hans and Jezza!

Oy weii!

10. ## Re: Grid 2

Sorry Hans, I don't speak Dutch. What would the Hebrew equivalent be? <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

11. ## Re: Grid 2

Am I missing something - I could get 3 squares thru reasoning but then I was stuck ...

12. ## Re: Grid 2

Tim

This may help.

Sudoku puzzles

It gives you some good techniques on how to solve these puzzles, after a while you kind of flow into your own methods.

13. ## Re: Grid 2

It also helps if I read the instructions ... I failed to see the part about "the 3x3 contain the numbers 1-9" I was solving as if the rows / columns contained the numbers 1-9.

14. ## Re: Grid 2

Hi Tim,

Common fault - I am constantly telling my pupils that if all else fails, read the instructions. <img src=/S/grin.gif border=0 alt=grin width=15 height=15>