You probably won’t know this one. Planet Harriers was a 3D sequel to Space Harrier that looked loads of fun but saw limited arcade release and the promised Dreamcast sequel never surfaced. I may never get to play it either:

According to a survey conducted by Video Arcade Preservation Society of approximately 800 collectors and their nearly 20,000 games, there are no known instances of this game owned by a known collector.

So says Coin-Op Museum. They’re not even sticking it in the Space Harrier Complete Collection. The Not-Quite-Complete Collection then.