A departure for Sierra when it was first released, Thexder was not an adventure game of the type Sierra was famous for, but rather an action game. You controlled Thexder, a Transformer-like robot who could also turn into a jet. The game was somewhat interesting, though very simplistic. There was very little to do besides transform back and forth between the robot and the jet and shoot up the numerous bad guys that came at you. This wasn't exactly easy, since you had very limited energy resources, and conserving them enough to make it through each of the levels (some of which were very long and difficult to navigate through) was not easy. Though a somewhat interesting game, Thexder has little in it to differentiate it from other shoot-em-up games of this type.