The Superflat World is the name given to the collection of locations created for the Game & Watch games. The Super Smash Bros. Melee stage Flat Zone and the Super Smash Bros. Brawl stage Flat Zone 2 are representations of this collection. Both stages are actually "games" being played on a giant Game & Watch. As such, both stages are entirely flat and composed of black lines that form the various graphics needed.
The Superflat World is the home of Super Smash Bros. series playable fighter Mr. Game & Watch.
The Game & Watches were handheld consoles with one game programmed into each unit. The stages in Superflat World and the moves of Mr. Game & Watch are all based on Game & Watch games.
In a Dojo update, it is implied by Sakurai in his description of Mr. Game & Watch's role in the Subspace Emissary that good and evil do not exist in Superflat World.
 Game & Watch universe
| |
|---|---|
| Fighter | Mr. Game & Watch (SSBM · SSBB · SSB4 · SSBU) |
| Stages | Flat Zone · Flat Zone 2 · Flat Zone X |
| Trophies, Stickers and Spirits | Trophies (SSBM · SSBB · SSB4) · Stickers · Spirits |
| Music | Flat Zone · Flat Zone 2 |