Sudoku 2D (Mini Sudoku Series #5)

This is a very simple and basic Sudoku type. This Sudoku is generated using the computer program which I wrote some years back.
This is my 5th  Mini Sudoku puzzle in Mini Sudoku Series.

Sudoku 2D Instructions

Enter numbers from 1 to 4 so that each row, each column, and each main diagonal contain each number exactly once.

Sudoku 2D (Mini Sudoku Series #5)

Sudoku 2D  (Mini Sudoku Series #5) Solution 

Previous Mini Sudoku Series Puzzle: Sudoku 2D (Mini Sudoku Series #4) 

Next Mini Sudoku Series Puzzle:  Skyscraper Sudoku (Mini Sudoku Series #6) 

Here is the answer to my Daily Sudoku League Puzzle titled "Sudoku 2D (Mini Sudoku Series #10)"

Sudoku 2D (Mini Sudoku Series #10) Solution