The Immortal is an isometric adventure game originally created for the Apple IIgs, which was ported to the Amiga, Atari ST, MS DOS based PCs, NES, and Mega Drive/Genesis. The main plot revolves around a wizard attempting to find his mentor in a large and dangerous labyrinth. The game is known for its high degree of graphic violence (much reduced in the NES version) along with its punishing difficulty. Source: Wikipedia, "The Immortal (video game)", available under the CC-BY-SA License.