I once found a game on ticalc called Roller Coaster Tycoon. I was very disappointed that it was only a basic text-based game. 

3D+Axe+Rollercoaster->Head
**Head>255: brain clear.

Quote from: DJ_O on February 23, 2011, 02:21:24 am

Yeah true. In some 3D engines I saw usually the coder cheated to do some stuff at decent speed. I remember Thepenguin77 saying that about his Star Fox 84+ grayscale engine (btw that was cool )

To this point that is the only grayscale 3d engine I have ever seen for the 84+

I swear I saw another before, but it wasn't really 3D, more like raycasting. I think it's the raycaster Madskillz is talking about. I remember a topic from MaxCoderz or a package of grayscale demos from ticalc.org.