designed by Dan Bunten and published by Electronic Arts in 1983.

Subtrade was originally written for the Amiga, and later ported to MS-DOS.

Like M.U.L.E., the game is about four colonists (players) building up an economy on the planet Irata (Atari spelled backwards).

The objective is to become the richest colonist within twelve game turns, while also attempting to improve the overall health of the colony.

The most notable change in game play is the addition of a fifth choice of how to outfit the labour element.