Planet of Crawlers is a 1-player science fiction themed arcade game for the Apple II.
The player controls a spaceship on the bottom of the screen which moves horizontally and can fire vertically. The player has to avoid mushrooms, as well as a white and orange spiders. The spiders move towards the player, bouncing off the edges of the play area. The white spider moves more vertically, while the red one prefers a larger angle. These identical two monsters appear repeatedly. The player has 20 ships, and it's game over when all are lost. the player is awarded points for spiders killed.
In Plasmania, you are a microscopic ship traveling through your patient's bloodstream destroying viruses and pathogens. Be careful though! Every time you shoot or run into enemies or the wall of the blood vessel, you make your patient sicker. The game ends when the patient sustains too much damage and dies.
The player controls a small craft, navigating it through a series of winding caverns and tunnels while shooting or avoiding obstacles. The caverns scroll from the bottom of the screen to the top at a fixed speed, so the player must always move forward.