Bob-Omb Battlefield
Mario's Home Stage. This stage has two walkoff layers (the lowest ground with Koopa the Quick, and the middle ground with Chain Chomp) and a floating platform that cannot be dropped through (the island). Chain Chomp will attack the fighters sometimes, signaled by a loud bark. Koopa the Quick may also occasionally run across the stage, which can damage fighters. The For Glory variant is a Smashville reskin taking place solely on the island, with King Bob-Omb on the mountaintop in the background.
Paranormal Productions
Luigi's Home Stage. This stage features the fighters as actors on a movie set! Imagine Fourside, but smaller and with more buildings. There's also visuals on the screen to imply the player is looking through a camera, just like in the screenshot above. A Ghost dressed in a kaiju costume will attack the city sometimes, serving as a stage boss. The For Glory variant is a Wily Castle reskin on a rooftop. The camera visuals are still present in this variant, and the Ghost can still appear, but only as a background element.
Peach's Birthday Cake
Peach's Home Stage. Shamelessly stolen from the Mario Smash Thread (but it's okay because I submitted the idea), this stage is actually a reskin of Yoshi's Story, in which the main platform is made of cake and the floating platforms are eclairs. Randall the Cloud and the Shy Guys have been removed, though. This stage has no hazards and is identical in For Fun and For Glory.
Galactic Stadium
Daisy's Home Stage. Fighters actually cannot be KO'd off the blast zones here, as invisible electric fences surrounding the field will zap anyone who touches them. The only way to score a KO is to launch someone into one of the goals! The goals are made a lot taller than usual to accommodate for Smash's physics. The For Glory variant simply removes the fences and removes the collision on the goals.
Bowser's Castle
Bowser's Home Stage. Visually, the stage looks just like the image above only without the floating platforms and without the pixel artstyle. Also, the non-bridge parts of the stage are a bit wider. The lava keeps players from falling into the bottom blast zone, as it damages and launches fighters upward on contact. The Axe isn't always present, but when it does appear, you can touch it to cut down the bridge, removing a large chunk of the stage and adding more lava to dunk foes into. The For Glory variant is a Smashville reskin featuring a platform that looks like the ones used in Super Mario Bros. / All-Stars.
Waluigi Pinball (DLC)
Added to the game alongside Waluigi, this stage takes place on the actual pinball table segment of the iconic racetrack, with Waluigi and his slot machine in the background. The visuals match with the Mario Kart Tour verison of the track. The stage features bumpers that can bounce players around, and giant pinballs will occasionally be added into the mix. The For Glory variant is a WarioWare Inc reskin floating above the table, letting you see the entire table segment and Waluigi's slot machine.
Pipe Maze
An underground stage modeled after Super Mario Bros. 3. The stage is an 8-Player centric Temple-like Pipe Maze. Notably, any pipe can be entered to teleport a player to a different pipe. Just watch out for the occasional Piranha Plant! The For Glory variant is a much calmer Town and City (first form) reskin, with the floating platforms being made of tiny, thin pipes.
Birabuto Brawl
This stage takes place in the Birabuto Kingdom, with large pyramids in the background. The layout is identical to Small Battlefield, but the fighters may occasionally be attacked by Tatanga, who flies overhead and drops Super Mario Land enemies onto the stage that can all be defeated. The stage has three visual variants as well:
Muda Mayhem, Easton Excitement, and
Chai Challenge.
Vanilla Dome
Another lava stage, this time featuring the fighters on Skull Lifts traversing the boiling, Blargg infested caves! There are two Skull Lift platforms in the lava, one a ways ahead of the other, and Blarggs will often leap out to try and attack the fighters along the way! You'll also pass by ? Blocks on occasion that can be platforms but also provide items when struck. The For Glory variant has a regular Vanilla Dome style platform with two floating Skull Lifts as platforms in a Northern Cave layout.
Toy Time Galaxy
A very bright and colorful stage taking place on a giant toy train that flies through the Galaxy. You'll see everything, including the various blocks, Giant Mecha Bowser, 8-Bit Mario, and random dinner plates and desserts. There are no hazards, but the layout is train shaped, making things interesting regardless. The For Glory variant is a WarioWare Inc reskin made of platforms much like in the above image, floating in the middle of the Galaxy.
Dr. Mario
This stage is basically identical to the above image, although the giant Megavitamins may change layout sometimes, becoming a single floating platform or hanging off the ledges, for example. The For Glory variant is a Battlefield reskin using the pills as the platforms.
Oho Oasis
A beach stage featuring a bunch of Oho Jees and a big construct with Fire and Thunder imagery just like in the image above. The layout is a walkoff on the left side, with water off the beach on the right side. Hermie III may occasionally cameo in the background. The Oho Jees can get in the way of the battle, and if they do, attacking them drives them mad and makes them aggressive, at which point they must be defeated. If left alone, Oho Jees will just leave peacefully. The For Glory variant is a Rivals of Aether Treetop Lounge reskin on a floating chunk of land overlooking the area.
Marion Clubhouse
Another stage of mine I've stolen from Mario Smash. This stage is a walkoff with the fighters standing on the rug and being able to climb the stairs to reach the blast zones, making the layout resemble a U, sort of. The For Glory variant is a Small Battlefield reskin floating outside, overlooking the Marion Golf Course. The platform has Neil and Ella's golf bags resting on it as background visuals.
Lego Super Mario
A randomly generated stage (just like Super Mario Maker) featuring elements from all the Lego Super Mario sets. The For Glory variant is just a Wily Castle reskin taking place on the Lego NES.
and now, the returning classic stages:
Mushroom Kingdom (64)
Delfino Plaza
Golden Plains
New Donk City Hall
Super Mario Maker
Rainbow Road