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.