Brinstar (ブリンスタ, Brinstar) is the default Metroid stage that appears in Super Smash Bros. Melee, Super Smash Bros. Brawl, and Super Smash Bros. for Nintendo 3DS. It is essentially a redesign of Planet Zebes from the original Super Smash Bros..
The stage consists of a main, rocky platform, two soft platforms on the side and a hovering metallic soft platform in the center. The main platform can be passed through from below, and it actually consists of two parts held together by a fleshy blob on the right side: said blob can be weakened by attacks, and when destroyed the main platform gets separated. The same can happen to the fleshy poles which keep the main platform and the side ones together: when they are destroyed, the platforms that were being supported tilt at a very sharp angle.
The destroyable parts will start to regenerate if they are not continuously attacked, fully growing back after a while. While regenerating, the substance that holds the stage together is fall-through.
Occasionally, an earthquake occurs and acid starts to rise, sometimes covering parts of the stage. The acid deals damage and heavy knockback on touch, though while it is rising it will prevent characters from being KO'd on the bottom blast line. It will rise and pause at various intervals, rarely reaching its highest point where it will cover everything except the topmost platform (and the tops of the side platforms if their supports are broken). After a while, the acid subsides.
In the back of the main platforms there are some ruins and a lone Chozo statue, which occasionally gets up and walks around with no gameplay effect. The background is occupied by a large pool of acid with an unidentified fleshy being rising from it.
Brinstar is considered the best Jigglypuff and Ganondorf stage in Melee (due to Rest combos with Jigglypuff and forward aerial combos with Ganon off the lava) and one of the better Mr. Game & Watch and Wario stages in Brawl (due to air camping beneath the platform).
This stage used to be a counterpick stage because many did not see the acid as a major problem, and instead focused on its strange, but relatively non-obtrusive stage design. However, it was later banned in Melee and deemed more of a banned stage than a counterpick stage in Brawl, not making the stage list in major tournaments such as Apex 2012 despite the Unity Ruleset proclaiming it as a counterpick. This stage is still banned because many players agree that it gives monopolizing advantages to certain groups of characters. The acid reduces the stage to a very small size, forcing characters to stay in the air and giving unfair advantages to characters with good aerial games; characters with good meteor smashes or spikes also dominate as they can repeatedly rack up damage by thrusting unfortunate opponents into the acid, which knocks them back up to repeat the process.
Brinstar is the first level that the player has to venture through in original Metroid. It is a large cave complex in the underground of Zebes, like most of the locations of early Metroid games.
Some rooms in Metroid's Brinstar feature yellow acid on the ground, which deals continuous damage on contact. Said acid also appears in Super Metroid: it starts to rise in Mother Brain's room after an earthquake, which could be the inspiration of the acid's movement in this stage.
A large part of Metroid's gameplay is exploration, which often involves destroying blocks with bombs to reveal secret passages: in particular, some blocks have a fleshy appearance similar to the one of the middle section of the stage. The pillars at the sides of the stage could be a reference to the Zebetite pillars which act as obstacles in Mother Brain's room in both Metroid and Super Metroid: they both get thinner with subsequent hits until they get destroyed; howevere in the source games they don't grow back.
The blocks with angry faces originally appeared in Metroid in the room where the Morph Ball is found.
In the Metroid games Chozo Statues act as pedestals carrying items in their hands. Some of them are able to walk, carrying Samus with them enabling her to reach hidden areas, while others, called Torizos, are hostile and act as mini-bosses.