Rip Off was a good one. It looked a lot like Asteroids; simple monocolour lines. You could play one person or two, and with 2, You can play as a team, or as opponents, but either way, there is a common goal.
There are a bunch of "fuel" triangles in the middle, and alien ships come in shooting, and also trying to steal the fuel, and drag it off the screen. You're trying to shoot the alien ships for points, and trying to defend the fuel to keep the game going. You have left-right-up-down acceleration, and if you go off the screen, you come out on the opposite side. If an alien ship hits you, or if you collide with either an alien ship or your team mate/opponent, You disintegrate, and return in the same spot a few seconds later.
I only remember seeing this one in a few places, but I remember that the artwork on the machine was by comic book artist Frant Brunner.