Mushroom Kingdom (SSB)
Mushroom Kingdom (いにしえの王国, Ancient Kingdom) is the only unlockable VS. Mode stage in Super Smash Bros.. While it does not return in Super Smash Bros. Melee, a similar stage also called Mushroom Kingdom appears. The stage later returns in Super Smash Bros. Ultimate as a familiar stage.
In the middle of this stage is a pit. To the right of it, there are two soft floating platforms, and a pipe to the right of them. To the left of the hole, there is a single floating soft platform, and a solid brick platform left of that which extends to the edge of the stage. In the background, a grey castle can be seen, along with some mushroom platforms.
There are three pipes which characters can warp in between. When standing on a pipe, if the player presses down on the controller, their character will transfer through to another pipe. In Ultimate, down must be held for a moment before the pipe will be entered, and after a character travels through one, they cannot use the pipes again for another 13 seconds to prevent abuse of the warps. One of these pipes is on the ground to the right of the stage, and another is on top of the brick platform to the left. There is a third pipe embedded in the left wall of the chasm, in such a way that only its mouth can be seen; in 64 this pipe is exit-only but enterable in Ultimate by holding left while next to it, although there is a chance the pipe will reject the character and immediately spit them back out. Characters are randomly sent to either pipe, although if one pipe is blocked, the character will always come out of the alternate pipe. Additionally, two Piranha Plants occasionally come out of the pipes and inflict low damage (5%), but can be knocked away with a powerful attack. The Piranha Plants knock any characters who hit them straight upward with relatively high base knockback albeit extremely low knockback scaling, usually not KOing until very high percentages. They can be used during combos or to setup moves. Using the pipes is not typically a reliable strategy, as the player may exit into the abyss, which could lead to the player falling down the bottom blast line and self-destructing, or at minimum being left open to attack.
In the middle of this stage is a fissure, which is the place players can be KO'd by falling down. Above the crevasse is a scale with two soft platforms. It is possible to stand on the two platforms, but the character's weight will unbalance them. If unbalanced too far, the system will break and fall into the crevasse, and then regenerate a few seconds afterwards. This gap is the cause of many AI flaws.
Occasionally, a small, rectangular POW Block will appear in one of several locations in the air. Hitting it with an attack will cause the screen to vibrate, with every character touching the ground or a platform being dealt 20% damage and great knockback.
If the hazards are turned off in Ultimate the lift platforms are absent, the Piranha Plants never come out of the pipes, the POW Block never spawns, and players cannot travel through the pipes.
Ω form and Battlefield form
In Super Smash Bros. Ultimate, the Ω form and Battlefield form are suspended in the air with no platforms extending below the blast line and no walk-offs. The POW Block, scales, and Warp Pipes are also absent. The main platform is an arrangement of ground blocks that match the size and shape of Final Destination and Battlefield, respectively. In order for fighters to not get stuck in the corners when recovering, and to make this form match their respective forms, there are invisible slopes along both sides. The three soft platforms of the Battlefield form are based off the soft platforms of the regular form.
This stage is based on the overworld levels of Super Mario Bros., in which Mario can enter Warp Pipes to underground levels or bonus rooms; when underground, the player has to go into another Warp Pipe to return to the overworld. Some Warp Pipes have Piranha Plants that emerge from them as a hazard. There are also certain levels that have scales that have a platform that goes down when Mario is standing on it, while the other platform connected to it goes up. If Mario stands on the platform for too long, the scale breaks and both platforms fall. This stage retains the aforementioned elements; however, the Piranha Plants are red, as in Super Mario Bros.: The Lost Levels from World 4 onward.
In the arcade game Mario Bros., the goal is to hit the enemies from under a platform to flip them over, and then get to the top of the platform to kick them off. If the player feels overwhelmed by how many enemies are on the screen at once, the player can go to a POW Block to knock all the enemies on their back. In this stage, if a fighter hits the POW Block that occasionally appears, it launches their opponents upward.
This stage is universally banned in standard tournaments due to hazards such as the POW blocks and randomized Piranha Plants disrupting gameplay, the pipes allowing heavy side camping, and the walk-off blast lines allowing even further side camping and allowing characters who can chaingrab past the blast line (such as Pikachu using its forward throw) to KO at very low percentages. Alongside Sector Z, it has never been considered a legal stage.
Super Smash Bros. Ultimate