The Immortal is a game that can be quite difficult to play. It takes time to master, but the interface is quite okay. You will be picking up a lot of items and weapons that you can use along the way to find your Mentor, who suddenly disappeared. The quest involves you searching through the labyrinth and facing many different monsters just to find him. All in all, this game requires mastery and entails a lot of time to play. Expect that you will die a lot of times, but when you do, just learn from it and avoid doing the same mistake again.
Other than that, it's also fun, and back then, I found this game quite unique for a Sega Genesis game. There are many different versions of the death scenes, more than a dozen of them actually.
I'd recommend that you add The Immortal to your Sega Genesis collection.