Mr. Game & Watch is a man from Superflat World, a completely flat world, having no third dimension whatsoever. He is also monochrome, and due to the LCD display of the Game & Watch, he can only move in alternating, preset frames, similar to the numbers on a calculator, or the Game & Watch games themselves.
In the Super Smash Bros. series
In Super Smash Bros. Melee
Mr. Game & Watch makes his Super Smash Bros. series debut as the final unlockable character in Super Smash Bros. Melee. Mr. Game and Watch can be unlocked one of four ways: completing either Classic Mode or Adventure Mode with all characters on any difficulty and stock or the Target Test with all characters, or playing 1000 vs. mode matches. He fights with a variety of items derived from the Game & Watch series.
In Super Smash Bros. Brawl
He reappeared as an unlockable playable character in Super Smash Bros. Brawl. Interestingly, in a DOJO!! update where Sakurai explained some mysteries about the Subspace Emissary, he says that Tabuu used Mr. Game & Watch's flat qualities to create Shadow Bugs, making Mr. Game & Watch the origin of Shadow Bugs, though Mr. Game & Watch is not aware of it himself.
In Super Smash Bros. for Nintendo 3DS
He reappeared as an unlockable playable character in Super Smash Bros. for Nintendo 3DS. He was teased before release in a small appearance at the end of Pac-Man's reveal trailer to illustrate how the two are the oldest characters in Smash Bros. history (even older than Mario and Donkey Kong); in that cameo, he notably performs his down taunt from Brawl, which was replaced by the release of Super Smash Bros. for Nintendo 3DS.
In Super Smash Bros. Ultimate
He reappeared as an unlockable playable character in Super Smash Bros. Ultimate.
- Conceptually, Mr. Game & Watch is the only 2D playable character in the Smash Bros. series.
- Mr. Game & Watch is the oldest playable character in the Super Smash Bros. series, having debuted in April 1980.
- Mr. Game & Watch and Falco Lombardi are the only characters who appeared as unlockable in multiple Super Smash Bros. titles to remain as unlockable in both versions of Super Smash Bros. for Nintendo 3DS. Counting the two versions separately, they, along with Jigglypuff, are also tied for the most unlockable appearances in the series, with five.
- One of Mr. Game and Watch's victory poses in Ultimate references to his appearance from Ball.