Apparently Dragon Hopper, the canceled Virtual Boy game, made it far enough in development to receive an ESRB rating: https://www.esrb.org/ratings/1840/Dragon+Hopper/
I’ve been interested in this game for years, since I saw it on the old VirtualBoy.net. Wished for someone to find a copy since then. Alas, it’s still lost. Weird if it was far enough along to be rated!