Here’s a demonstration video of the unreleased Virtual Boy game Niko-Chan Battle, a version of MIDI Maze / Faceball 2000.
Finding a prototype of the game had been one of the longstanding goals of the Virtual Boy scene, to the extent that a Virtual Boy scene can be said to exist. A mysterious Japanese person by the name “Mr. G” started posting screenshots and videos on the Planet Virtual Boy forums, and everyone there went bananas. “bigmak,” a member of the forums, later acquired the prototype for over $10,000 and released the ROM for free, which is pretty stupefying, but then these collectors are pretty serious about what they do.