Space Harrier 3-D is more like Space Harrier 1 1/2. While it's not a direct sequel to Space Harrier, it was designed to take advantage of the 3-D glasses available at the time. This game is considerably darker than the original and the sequel in both look and feel. Even the digitized voices are deeper in tone, creating a sense of urgency about it. Things are obviously not right in Space Harrier's world. But if you're familiar with the original, the premise is the same; blow everything up and fight the boss at the end.