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Port Town Aero Dive

This is the place where the manliest entity was born (not the stage, mind you). His name is Captain Douglas Jay Falcon. This stage is a highly upgraded version of Melee's Mute City. Although the stage works the same, everything is slightly changed. The scenery is breathtaking, just like Delfino Plaza. The platform that flies around Port Town is also pretty cool to look at. Also, the cars hit VERY hard. Each ram makes you take 20%, but it sends you pretty damn far. Although if you have good awareness, you can dodge the cars easy and laugh as your opponent goes blasting off again. =) This stage has the BEST music, imo. White Land, Fire Field, Shotgun Kiss, my God. Who can argue with those songs?
Shadow Moses Island

This stage was actually designed by Hideo Kojima himself. The stage has breakable watchtowers (which then lead to walk-offs, be careful), a spotlight that if it shines on you, the famous "!" appears over your head (although you're in no danger when it happens), and occasionally, Metal Gear REX, Metal Gear RAY, or two GEKKOs will bust through the background (again, still no danger). This stage is fun for caged fights, but then quickly turns into KO or be KO'd when the watchtower is destroyed, since everyone will be crazy for that walk-off kill. Like Fox, Falco, and Wolf, Snake can also do codec messages that trigger conversations and explanations on Snake's opponent. If Snake is KO'd during the codec, the the person on the other end stops their speech and gives the infamous "SNAAAAAKE!" Game Over shout.
Pokémon Stadium (Melee)

Straight from Melee, it's Pokémon Stadium. Basically the same thing as Pokémon Stadium 2, only not as big, and doesn't have heightened graphics. The stage changes are still kept here. There appear to be no changes from the Melee version, which is a good thing. =)
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{B}anned Stage{s} ::.
Q. What is a banned stage?
A. A banned stage is a stage not allowed in tournament play due to several reasons. Some may be size, stage hazards, the stage itself, etc. While although some banned stages are fun to play on, others make you wonder, "Why the hell is that stage in this game?"
75M

Reason: This stage is too huge. It also has unpredictable stage hazards and walk-off edges.
Bridge of Eldin

Reason: The stage has walk-off edges and stage hazards. Plus, if you're playing with Smash Balls, you're prone to cheaters who can perform the stage glitch (if you're wondering what the glitch is, click
here).
Distant Planet

Reason: The stage has walk-off edges and free ammunition. Also, the Red Bulborb is an instant-KO factor.
Flat Zone 2

Reason: The stage is way too small. It was walk-off edges and stage hazards everywhere.
Green Hill Zone

Reason: The stage has walk-off edges and a continuous stage hazard.
Hanenbow

Reason: The everchanging platforms make it hard to concentrate on the fight. Instead, you tend to concentrate on just staying alive. Also, the water is fake, which commonly misleads players.
Mario Bros.

Reason: Tons of walk-off edges and lots of stage hazards here. Plus, when you hit a stage enemy, you get free, powerful ammunition.
Mario Circuit

Reason: Walk-off edges once again. Plus, you have the Shy Guy racers who hit you if you get in the way.
Mushroomy Kingdom

<--->

Reason: A forever-scrolling stage. Depending on where you fight, there could be walk-off edges. When you fall in a pit, you die immediately, just like in Super Mario Bros. The pits often confuse the players, making it a really ridiculous stage for competitive play.
New Pork City

Reason: TOO HUGE. Coward players dominate here, because there's tons of area to run away from. Pit and Meta-Knight have the biggest advantages here, because they can fly anywhere quickly. Also, the Ultimate Chimera is an instant-KO factor.
Norfair

Reason: While although bigger than Brinstar, you're more prone to lava bursts everywhere. From the side, from the background, and after a minute or so, you get a giant tsunami of lava coming after you.
Pirate Ship

Reason: The bombs in the background are too powerful and destructive, and you usually don't tend to notice the first bomb hurled at you. Plus, the catapult, at high %, can prove to be an instant-KO factor. Also, the rudder of the ship is also an instant-KO factor if you linger under it.
Rumble Falls

Reason: Similar to Mushroomy Kingdom.
Skyworld

Reason: I'd be fine with this stage except for the breakable terrain. You can't grab onto the clouds afterwards. Plus, this stage literally reads out "GIMP KILLS HERE." You can get gimped so quickly it's not even funny, and there's tons of places to do it.
Spear Pillar

Reason: First, you get either Dialga, Palkia, or Cresselia. Dialga slows time, summons a beam, or gets off his pedestal to attack anyone who gets in his way. Palkia slows time, summons a beam, or reverses the screen (and your controls). Cresselia is by far the most annoying. She uses Psycho Cut to attack in random directions, or uses a boomerang version of Dialga/Palkia's beam.
Summit

Reason: Again, this stage would be pretty cool EXCEPT FOR THE FISH. They're an instant-KO factor.
WarioWare, Inc.

Reason: Winning a microgame gives you star power, giant, reduces damage, or gives you an item (if you're playing with items). It kinda proves unfair.
Big Blue

Reason: There are walk-off edges on both sides of the stage. Also, if you get spiked onto the floor, it's really hard to get back on the stage because of the fast-scrolling track.
Brinstar

Reason: Similar to Norfair.
Corneria

Reason: They seriously messed up the dimensions on this stage. A Jigglypuff can die on the fin of the Great Fox if you hit her with say, Capt. Falcon's fully-charged U-Smash. That's not how it was in Melee. Also, there are the Arwings that shoot at you.
Green Greens

Reason: Again, the dimensions are messed up. The bomb blocks also prove harmful if you're near the detonation.
Onett

Reason: There are walk-off edges. Plus, although the cars are easy to dodge, if you get hit by one, you take 30% on the spot.
Rainbow Cruise

Reason: Olawd another moving stage. <_< >_> <_>
Temple

Reason: The perfect FFA stage. However, not so much the best singles stage. Like New Pork City, it's too huge. Plus, the stage is good environment for camping scrubs.
Yoshi's Island

Reason: The stage is way too small. Plus, there are walk-off edges.
And this concludes my opinion on the Brawl Stage Legality. Feedback is very welcome. =)