With a bit of time on my hands, I decided to have a go at making a 3D engine using nothing but ASCII at the Windows Command Prompt. I was surprised how sophisticated you can be with just 200 lines of hastily written C++ code.
This video shows it off, talks about how it works, and you can grab the code from github, or visit my onelonecoder.com blog.
Github: https://github.com/OneLoneCoder/CommandLineFPS
https://discord.gg/WhwHUMV
Blog: http://www.onelonecoder.com