Metroid stage design in a nutshell...
64...
Developer 1: Hey guys, we're missing a Metroid stage!
Sakurai: I hate Metroid. We don't need a Metroid stage.
Developer 2: But Samus needs her own stage, doesn't she?
Sakurai: ...Fine. I played Metroid before. Isn't it that game with the caves and lava?
Developer 1: Well, I was thinking of the Crateria setting from Super Metroid, or some of the more vibrant Brinstar sett-
Sakurai: Nah, let's just make a stage in a cave with lava.
Developer 1: But Brinstar...
Sakurai: Okay, we'll call it Brinstar.
Melee...
Developer 2: Hey, let's add another stage for each returning franchise!
Sakurai: Sounds good to me; I'd love two Kirby stages.
Developer 1: For a Metroid stage, I was thinking something set in the greenery of Brinstar, with Kraid walking around in the backgro-
Sakurai: Don't we already have a Brinstar?
Developer 2: Well, he was meaning a Brinstar more like Super Metroid's-
Sakurai: Fine, we'll make another Brinstar stage. God, you guys love that place.
Make it another cave with some lava and put this "Kraid" guy in the background. He's the short guy with the hair, right?
Brawl...
Developer 1: Oh my gosh, we have to make some cool new Metroid stages! There are a bunch of new Metroid games to choose from!
Sakurai: We already made two.
Developer 1: But...
Sakurai: What, you want another one?
Fine. I'll go play through Metroid and see what areas catch my eye.
*...A few days later...*
Sakurai: Alright, the two main areas are Norfair and Brinstar. We've already done Brinstar twice, so let's do Norfair next. Norfair's a cave with lava, and you seem to love those.
Developer 2: What about Tourian?
Sakurai: What, you sneezin' or something?
Developer 2: Tourian, the last area in the original Metroid.
Sakurai: Stop talking like there's more than one of these games. Anyway, I didn't get that far, so make Norfair.
Developer 1: What about a level from the Metroid Prime series?
Sakurai:..........The what?
Whatever, make another cave with lava.
Developer 1: But I'm sick of caves!
I'm sick of lava!
I want a cool and unique Metroid stage, like Phendrana Drifts, or Chozodia, or-
Sakurai: Fine, fine.
Metroid's in space, right? Make a level in a space ship.
Developer 1: