# Sudoku X

## Background

In addition to the standard Sudoku rules, this has the additional constraint that the two main diagonals must also contain one of each digit.

## Puzzle and Goal

An unsolved puzzle consists of a 9x9 grid containing nine 3x3 regions. Some of the cells contain a number between 1 and 9.

The goal is to fill in all the cells so as to create a Latin Square.

## Rules

The solved grid must satisfy the following conditions:

Every rank, region, and main diagonal must contain each digit from 1 to 9.

## Other Names

Diagonal Sudoku; Extreme Sudoku; X-Sudoku