Armor...Attack was one of the more eyecatching games in the arcade, due to its creative use of an overlay. The covered overlay contained a maze of buildings and corridors that actually contrained movement, thanks to a corresponding set of invisible walls underneath it! (Of course, since those walls were invisible, it's rather hard to play on this emulator.)
Your Jeep (and a friend's Jeep, if you play doubles) drive around this maze of wreckage hunting and being hunted by tanks and helicopters. One shot stopped a tank cold, but its turret could keep swinging; the second hit knocked it out for good. Even with a friend, you're always outnumbered, and when the helicopter arrives (which can fly over buildings), you need quickness and sharp aim to survive. Read the Vectrex Armor...Attack manual, from the best known port of this game (up until now, anyway). Some Armor...Attack dipswitch settings, which may or may not work with this emulator version. (original doc by Gregg Woodcock)Check out the overlay for the Vectrex version.
(If you are using a text browser, download the Armor...Attack screenshot here.)