How do I program a simple pseudo3d engine?

JoyfulDreamer made a post a while back that went over the math involved to create a pseudo3d game(akin to Doom or Mario Kart SNES). After reading the post numerous times and attempting a few,broken examples, I've had little luck. The math seems simple and I don't think that's the issue, can anybody put up a simple example .capx to show how this is implemented, or explain the events that would be required, or any information that may be of assistance.

This is the post from JoyfulDreamer:

https://www.scirra.com/tutorials/534/ps ... mes/page-1

This is the closest I've come to getting it working.

If you look at his tutorial you will see that there is a link to arcade, where you can actually download his capx file.

It is :O Well that's embarrassing, thank you very much.