Here's a game I'm working on for the Atari 2600. The main concept so far is this: you're an antibody that travels through the blood stream looking for toxins and microbes. Your job is to gobble them up without running out of energy or consuming your host's nutrients.
So far the game doesn't do anything except render part of a level. The hard part, besides learning 6502 instruction timings and working with 128 bytes of RAM and no video buffer, has been trying to get an asymmetrical play area with enough cycles left over to position everything else. I found a solution by playing H.E.R.O. and realizing that the programmer wasn't using an asymmetric playfield after all, but really just positioning the ball graphic to fake it. That's what I'm currently trying to emulate.
A simple screenshot.
Feel free to download the source. It was going to be a Mars caverns rescue game, so the source file is titled mars. Don't let that fool you.
mars.asm (17.3k)