You are Trentor, a space trader on board of the ship Pegasus, starting your routine trip between the six moons of the gas giant Meridien. The perils of interstellar travel await you, along with mind-reading aliens, robots, and even more dangerous humans. Deal with the usual synthetic food, fuel, gold —or take your chances with the illegal drug boosterspice.

Trader is a game (split into 3 programs) featuring simple action sequences, quiz questions, trading and a plot advanced by text and animation (the manual booklet also contains a short story). After finishing the one-time scripted trip the player is given a score based on the amount of money earned.