One of Game and Wario's many features was an experience called 'Gamer,' which you see above. On the right-hand side of the screen you can see a Virtual Boy in 9-Volt's room. A nice tribute to one of Nintendo's least-popular platforms ever. Well it turns out the Gamer game has been updated for WarioWare Gold, which you can check out below.
Boy, that's both sad and beautiful. Not only have a GameCube and a Super Famicom been added, 9-Volt has removed the Virtual Boy from his room and put a Wii U in the same spot. Yet another Nintendo hardware release that didn't really find an audience. May it live on forever in WarioWare!
Thanks to @TinTinfinite for the heads up!