- Not to be confused with Flat Zone X.
Flat Zone 2 (フラットゾーン2 Furattozōn 2?) is a stage in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS. It is the second Game & Watch stage in the Super Smash Bros. series, the first being Flat Zone in Super Smash Bros. Melee. Likewise, it is set on a standard Widescreen Game & Watch titled "Super Smash Bros." Unlike Flat Zone, however, this stage shifts between different Game and Watch scenarios, making it somewhat livelier than the original Flat Zone.
- Fire (1981 version): People jump out of a burning building as firemen with a trampoline attempt to catch them. The levels of the building can be stood on, and the trampoline that the firemen use can be bounced off of like a spring. When the firefighters aren't present, the randomly moving platforms from Manhole appear, similar to those in Super Smash Bros. Melee's Flat Zone. The treasure diver from Octopus sometimes appears, collecting items lying on the ground. This scenario is the main area of the stage - the match always begins here and the other games have to revert to Fire before the stage can change again.
- Oil Panic's bottom screen (1982): A multi-tiered gas station building can be stood on. Customers standing below attack if touched by players.
- Lion (1981): The center of the stage is a three leveled cage. Two Lion Tamers holding chairs flank either side, moving up and down. If players get hit by a chair, they take massive damage and knockback, often right into the Lion Tamer at the other side of the cage and taking even more damage due to the direction of where the characters are knocked at.
- Chef (1981): Two sets of platforms hover in midair, while falling food items can damage players. If the chef is hit with a strong enough attack, he flies off screen and the game returns to Fire.
Different alarm elements signify that the stage is about to change.
- Fire: A fireman appears in the top right ringing a bell.
- Oil Panic: A policeman appears in the top right ringing a bell.
- Lion: A panther in the top left corner rings a bell.
- Chef: A kettle appears to the left boiling to steaming point. The steam is in the shape of a bell.
Like its predecessor, Flat Zone 2 is banned in competitive play, due to the variety of damaging hazards (such as the falling food items in the Chef scenario and the lion tamers in the Lion sequence), the small size of the stage, the camera's refusal to zoom in at any point, the constantly changing stage setup, and the removal of the lower blast line (which makes techniques that require it, such as Meteor Smashes and Edgehogging, virtually useless). Furthermore, the walk-off edges allow characters to throw or spit others off the side blast lines. As well as the upper and sideways blast-lines being too close.
This stage layout is based off the "Widescreen" re-release of Fire for the Game & Watch handheld gaming devices, first released in 1981, but the original model for Fire was released in 1980 as part of the "Silver" series. The only indication of which game the device that surrounds the stage supports is the blue outline, as Fire was the only Game & Watch device from the "Widescreen" series to have a blue outline. The stage transformations are based on the Fire, Lion, Oil Panic, and Chef models of Game & Watch devices. The platforms that periodically change positions during the Fire and Chef stage elements are based on the Manhole Game & Watch device.
- The borders of the stage can be used to secretly charge attacks, or hide from final smashes like Super Sonic.
- Although having no significant effect to gameplay whatsoever, it is worth noting that on this stage, all characters are two-dimensional (or rather, their three-dimensional models are flattened). Strangely enough, certain effects are still three-dimensional; if pausing the game and changing the camera angle, the player notices them sticking out of the Game & Watch LCD screen. Hanenbow is similarly 2D.
- Whenever a player gets Star KO'd or Screen KO'd, both the character and the effects fly off separately. This can be best seen from Olimar's beacon on his antenna, the flame on Charizard's tail, and whenever a character is frozen. This also happens in Hanenbow.
- Flat Zone 2 and Mario Bros. are the only "fixed camera" stages in the game.
- Flat Zone, Flat Zone 2, PictoChat, PictoChat 2, and Dream Land are the only stages in the Super Smash Bros. series to be based on an actual system.
- The firefighters with the stretcher are actually playing the game Fire with the Game & Watch people in the background. However, three misses does not become a "Game Over" in this case.
- Lion is generally considered to be the odd one out. It is the only Game & Watch game that is not part of Mr. Game & Watch's Special Moves, instead being part of one of his tilt attacks. As well as that, it is the only game that did not use the "Left - Right" button configuration that is on the Flat Zone 2 system.
- In English, the top of the Game and Watch says, "Super Smash Bros." In the Japanese version, it says "Smash Brothers", due to the series being called "Great Fray Smash Brothers" in Japan.
- This stage can be seen prior to its unlocking in a clip of Diddy Kong's Congratulations video in Brawl.
- Lion and Oil Panic were never a part of the Widescreen series of Game & Watch games, despite their appearance on the stage. In fact, Oil Panic was a part of the Dual-Screen series so there is an entire screen missing from the stage.
- Unlike the original Widescreen devices, the device that surrounds Flat Zone 2 doesn't say "Nintendo" beneath the Game & Watch logo on the left.