Use the numbers 1 -12. Each row, column, and diagonal must equal 26. The four corners and four center numbers must equal 26 too.

(12)____(3)

(4)(5)(11)(6)
(9)(8)(2)(7)
(1)____(10)

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Giselle's answer is not correct. Diagonals don't equal 26.

To solve this puzzle, you need to arrange the numbers 1-12 in a grid so that each row, column, diagonal, the four corners, and the four center numbers all add up to 26.

Here's an explanation of how to solve this puzzle step by step:

1. Start by placing the numbers 1 and 12 in opposite corners of the grid. This is because the four corners must add up to 26. Here's an example of how you could arrange them:
```
12 _ _ 1
_ _ _ _
_ _ _ _
1 _ _ 12
```

2. Next, place the numbers 2 and 11 in the center of each side of the grid. This is because the four center numbers must also add up to 26. Here's an example of the updated grid:
```
12 _ 2 1
_ _ _ _
1 _ _ 12
```

3. Now, let's focus on the diagonals. Since the diagonal sums must be 26, we can fill in some numbers. Let's place 3 and 10 on the top left to bottom right diagonal:
```
12 _ 2 1
_ 3 _ _
1 _ _ 12
```

4. Since the diagonal sum is 26, we can deduce that the opposite diagonal must also sum to 26. Therefore, let's place 9 and 4 on the top right to bottom left diagonal:
```
12 _ 2 1
_ 3 9 _
1 4 _ 12
```

5. Now, we can fill in the remaining cells by following two rules:
- Avoid repeating numbers in the same row, column, or diagonal.
- Make sure each row, column, diagonal, the four corners, and the four center numbers all add up to 26.

Using these rules, here's one possible solution to complete the grid:
```
12 7 2 1
5 3 9 0
1 4 8 12
0 6 11 12
```

By following these steps, you can solve the puzzle and arrange the numbers 1-12 in a grid where each row, column, diagonal, the four corners, and the four center numbers all add up to 26.