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Curious Cheetah

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:

Other Names

Diagonal Sudoku; Extreme Sudoku; X-Sudoku