The Immortal is an isometric action-adventure game originally created for the Apple IIGS. It was soon ported to the Amiga, Atari ST, DOS, Nintendo Entertainment System, and Genesis. A wizard is attempting to find his mentor in a large and dangerous labyrinth. It has a high degree of graphic violence. In 2020, it was re-released for Nintendo Switch.

The game takes place on a labyrinth with 8 levels (7 levels on the Nintendo version). The player must solve puzzles, avoid deathtraps, use magic spells, and acquire various items. Certain items will bring instant death to the player if used unwisely. Some magical items and objects can be purchased from a merchant character in certain levels, using gold pieces acquired.

A variety of non-player characters wander or protect a specific portion of the map. Fireball spells can be freely used to dispatch these enemies on the isometric field but not in combat mode, which is initiated upon touching them. The player can dodge, and swing and stab with a sword. Certain levels allow the player to possess a flying magic carpet, cast a levitation spell, and paddle a floating barrel.