Gamedev.net is hosting a 5-part tutorial series designed to help beginners set up an Orx project and create a simple 2D game.

You can jump to the five parts here:

1. How to write a 2D UFO game using the Orx Portable Game Engine - Part 1
2. How to write a 2D UFO game using the Orx Portable Game Engine - Part 2
3. How to write a 2D UFO game using the Orx Portable Game Engine - Part 3
4. How to write a 2D UFO game using the Orx Portable Game Engine - Part 4
5. How to write a 2D UFO game using the Orx Portable Game Engine - Part 5