Asteroids ROM

Also, be sure to check out Alleyway.

Asteroids is a space-themed multidirectional shooter arcade video game designed by Lyle Rains and Ed Logg released in November 1979 by Atari, Inc. It was ported to the Game Boy in 1992. The player controls a single spaceship in an asteroid field which is periodically traversed by flying saucers.

The object of the game is to shoot and destroy the asteroids and saucers, while not colliding with either, or being hit by the saucers’ counter-fire. The game becomes harder as the number of asteroids increases. The objective of Asteroids is to destroy asteroids and saucers. The player controls a triangular ship that can rotate left and right, fire shots straight forward, and thrust forward. 

Once the ship begins moving in a direction, it will continue in that direction for a time without player intervention unless the player applies thrust in a different direction. The ship eventually comes to a stop when not thrusting. The player can also send the ship into hyperspace, causing it to disappear and reappear in a random location on the screen, at the risk of self-destructing or appearing on top of an asteroid.