I'm drawing up designs for an arcade machine with multiple PCBs (printed circuit boards).
So I'm brainstorming a huge list of awesome arcade games for it.
This project is probably going to happen over a few years, as PCBs and JAMMA cables are incredibly expensive, but it's fun to dream all the same.
So far I've only scratched the surface of awesome classics with my list:

-->Tetris
-->Pacman
-->Breakout
-->Galaxia
-->Donkey Kong
-->Missile Command

Does anyone know of some great arcade games that are off the beaten path?