Game Boy Gallery is a collection of Game & Watch mini games (Ball, Vermin, Flagman, Manhole, and Mario’s Cement Factory) released in Europe and Australia in 1995 for the original Game Boy. Aidan noticed that a 1994 UK ad for the Super Game Boy has beta footage of Ball, Vermin, Manhole, and Vermin’s mode select screen. The footage is only a couple of seconds (or, in Ball’s case, a couple of frames), but you can check a few screenshots here, with comparisons to the original G&Ws and the final version of Game Boy Gallery. Manhole’s character also changes his expression!
Thanks to Aidan for the contribution!