Building on the success of Asteroids, Atari upped the ante with Asteroids Deluxe, which brought several new gameplay elements into the mix. Chief among them was a fix to a well-known exploit that allowed players to play for long periods by exploiting the saucers' inability to shoot across the screen boundary, as well as the addition of a shield, new "killer satellites" and a colorful painted backdrop that added additional depth to the one-color, 2D gameplay. MAME does a good job of simulating the backdrop, but you may need to adjust the vector graphics contrast to suit your taste.