freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-166-criss-cross.md

---
id: 5900f4131000cf542c50ff25
title: 'Problem 166: Criss Cross'
challengeType: 5
forumTopicId: 301800
dashedName: problem-166-criss-cross
---

# --description--

A 4x4 grid is filled with digits d, 0 ≤ d ≤ 9.

It can be seen that in the grid

6 3 3 0 5 0 4 3 0 7 1 4 1 2 4 5

the sum of each row and each column has the value 12. Moreover the sum of each diagonal is also 12.

In how many ways can you fill a 4x4 grid with the digits d, 0 ≤ d ≤ 9 so that each row, each column, and both diagonals have the same sum?

# --hints--

`euler166()` should return 7130034.

```js
assert.strictEqual(euler166(), 7130034);
```

# --seed--

## --seed-contents--

```js
function euler166() {

  return true;
}

euler166();
```

# --solutions--

```js
// solution required
```