Object is to move a space ship up or down through a horizontally scrolling asteroid field (half the asteroids moved left-to-right and half moved right-to-left).
Asteroids were just simple dots. Each time a player made it to the top of the screen a point was scored and the ship was reset to the bottom of the screen. Colliding with an asteroid reset player to the bottom of the screen. Game was timed.
"Maybe" Images
(fuzzy search, these MAY match the game, or they may not)