So it actually is possible to make Doom on NES.
It's incredibly impressive!
I've seen other attempts at 3d fps games on a variety of 8-bit systems, but none of them even attempted elevated floors.
The graphics could probably be improved by making it less blocky, but it would take a huge drop in framerate, because of the processing power needed to generate new tiles on the fly.
Anyways, it's an amazing tech demo.
NES games tend to have tiles in ROM, so for better or for worse, combining tiles isn't a speed issue, because it's not an option. The character bank in this release honestly has abundant free space. I just haven't committed to diagonals, or marching squares, or approximate 2x2 mini-tiles or whatever. Consoles like this deserve one and handhelds would absolutely require one.
Incidentally the Sega Master System would be fantastic for this. Flippable 16-color tiles, horizontal blanking interrupts, much more RAM. Expect cleaner and faster C code when the judging is over.
I think a Master System version with these improvements would be awesome.
Someone made a Wolfenstein 3D clone for Master System, using its hardware advantages for smooth graphics.
https://www.smspower.org/forums/19054-Maze3d
Ooh, very nice. Tyrannosaurus Tex on GBC did a similar thing with the precomputed diagonals, and honestly still looked kinda... lumpy. Oof. This one looks better in screenshots than in motion. Especially on Game Boy. I was already gonna make an SMS Power account to thank whoever mentioned Slaughter in the "off-topic inspiring technical stuff" thread, but I might do some thread necromancy first to nudge Under4MHz toward choosing tiles directly. Axis-aligned walls have predictable diagonals onscreen. (And every wall in Castle Wolfenstein is aligned with the Axis.)
