Rating: 4.7/5
This seems to be Game & Watch Gallery 2 even though it's called Gameboy gallery. It's a sequel to Game & Watch Gallery released in 1997 for the Game Boy. The game includes revisions of classic Game & Watch games, one of which must be unlocked. It was not released in Australia until 1998 when it was re-released on the Game Boy Color.
You also need an emulator to run this game. To grab one quickly, please check out our GB emulators section.