Scorpion is Sumlock's version of the Arcade game Centipede. When the game is loaded, the computer plays a short burst of the Star Wars theme music and starts the game.

Scorpion can be played with a joystick or using the computer's keyboard. You start with three lives. Cacti are randomly strewn across the screen and a centipede-type creature starts to descend from right to left. Whenever it is hit, the centipede splits from the spot where a segment was destroyed and each part finds its way through the cacti in opposite directions. The centipede also changes direction when it hits a cactus.

Every so often, a spider bounces across the lower portion of the screen gobbling up cacti, but if your ship comes into contact with it you lose one life. Every few games, on the second and third screens, an object shaped like a piece of seaweed wends its way across the cacti field. High points can be obtained if it is hit on the second screen upwards. Rocks fall from the top and leave a trail of new cacti.

After a whole centipede has been destroyed a new screen is generated and everything has a different colour. The only drawback is that no further instructions are given after those shown at the beginning of the game.